Questions tagged [ionization-energy]

The ionization energy of an atom or molecule describes the minimum amount of energy required to remove an electron from the atom or molecule in the gaseous state. Do not confuse with [electron-affinity].

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Why is the ionization energy of thallium less than that of lead?

Does lanthanoid contraction not affect the ionization energy trend of thallium, lead, and bismuth? My book says the trend for ionization energy is Tl< Pb< Bi.
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Ionization energy and charge localization: π-bonds/systems and ionization energy

Page 35 of my textbook, Mass Spectrometry by Jürgen H. Gross, says the following in a section on ionization energy (IE) and charge localization: Molecules with π-bonds have lower IEs than those ...
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In an emission spectrum, the limit of convergence at higher frequency corresponds to the first ionization energy

This is one of the syllabus points in the IB syllabus 12.1. We are advised to use the formula for the energy to remove one electron: $$E = hν$$ which apparently is the same as $$E_2 - E_1$$ where $...
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Are there processes of electric discharge to oxide As(III) into As(V)? [closed]

I want to know if there were any known experiment of electric discharge to oxyde the ion arsenic(III) into the ion arsenic(V).
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Removing ozone from a gas flow

I have a potential problem in that I need to reliably remove ozone from a stream of ionized gases, mostly air. The flow rate is quite low, less than 400 sccm. I was thinking of something catalytic, ...
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Why don't ionization energies vary linearly going down Group 2?

I understand why the 1st ionization energies (1st IEs) of Group 2 elements decrease down the group. However, why is the difference between 1st IEs of successive elements greater for Be to Ca and ...
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Heat of formation of aqueous H⁺

In my book it is given that by convention heat of formation of aqueous $\ce{H+}$ is taken to be zero. Heat of formation is energy released or absorbed when 1 mole of a compound is formed from its ...
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Electronic configuration of period 3 element from its successive ionization energies

Given below are the first five successive ionization energies $(\mathrm{IE})$ in $\pu{kJ mol-1}$ of an element in period 3. $$ \begin{array}{ccccc} \hline \mathrm{IE_1} & \mathrm{IE_2} & \...
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Relation between electron gain enthalpy and electron affinity

The correct relation between electron gain enthalpy $(Δ_\mathrm{eg}H)$ and electron affinity $A_\mathrm{e}$ at any temperature '$T$' is A) $Δ_\mathrm{eg}H = -A_\mathrm{e} - \frac{5}{2}RT$ B) ...
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What happens to the first ionization potential when a hydrogen-like atom captures a particle?

This is a textbook problem from Resonance DLPD Physical Chemistry, Page #83: The mass of a proton is $1836$ times the mass of an electron. If a subatomic particle of mass $207$ times the mass of an ...
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Why ionisation enthalpy of early lanthanides are expected to be greater than early actinides?

In my book Chemistry Part I (NCERT XII), a statement on p. 232 goes like this: It is evident from the behaviour of the actinoids that the ionisation enthalpies of the early actinoids, though not ...
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Relationship between effective nuclear load and periodic properties

The effective nuclear charge is defined as the net positive charge experienced by an electron in a polyelectronic atom. It can be calculated using the well-known Stars Rule. Once I have calculated ...
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Sorting ions by radius and ionization energy

Sort the ions $\ce{F-}$, $\ce{Mg^2+}$, $\ce{O^2-}$ by their ionic radius and the minimal energy needed to remove an electron. For the radius I considered that they all have the same electron ...
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Work function vs ionization enthalpy [closed]

I've seen that the work function of a particular metal is always greater than its work function. Is it the case always? If so why? For example, the first ionization energy of sodium is 5.14 eV/atom(...
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Second ionization energies of copper(Cu) and silver(Ag)

The ionization energies of copper and silver are First ionization energy: Cu-745.5 kJ/mol Ag-731.0 kJ/mol Second ionization energy: Cu-1958 kJ/mol Ag-2073 kJ/mol Now, looking at the ...
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Is the energy of the orbital an electron “resides” in, considered to be a factor of that electrons ionization energy? [duplicate]

The answers to a Quora question mainly refer to the factors as generally being, the electrostatic forces of attraction between the electron and the positively charged nucleus and all other events, by ...
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what is the basic factor which determines the order of ionization energies of K,Li,Ca,S?

There was a question which was asking about the order of ionization energies of K,Li,Ca,S. The electronic configuration of all the elements were as follows Li:${1s^2 2s^1}$ K :${1s^2 2s^2 2p^6 3s^2 ...
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is Li ion less stable than Li atom? [closed]

so our teacher introduced the concept of ionization energy... heres my doubt : if we remove an electron from , say, Lithium , we need to supply energy first and that will be very less compared to the ...
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Ionization energy of C2-, C2, and C2+

My textbook says that $\ce{C_2}^-$ has a lower ionization energy than both $\ce{C_2}$ and $\ce{C_2}^+$. I calculated that the bond orders of $\ce{C_2}^+$, $\ce{C_2}$, and $\ce{C_2}^-$ are 1.5, 2, and ...
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Ionization energy in Geiger counters

Geiger counters can detect radioactivity because nuclear radiation consists of particles or radiation of sufficiently high energy to eject electrons from atoms. Consequently, this type of radiation is ...
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Can visible light or infrared radiation excite electrons?

So the limit of ionizing radiation seems to be UV light. I'm wondering if IR light or Visible light can excite the electrons in an atom. It has to do with the difference in energy level right? So ...
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What is the ionization constant, $K_a$, of the acid?

A 0.45 M solution of a weak acid, HX, has a pH of 4.5. What is the ionization constant, $K_a$, of the acid? Attempt at solution: [HX] is already given as 0.45 M. [H+] is given by $10^{-4.5}$. ...
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Second Ionisation Energy in d Block elements

The second ionisation energy is expected to be highest for element with atomic number: 22 24 25 30 I had expected the answer to be option 2 because the second electron has to be ...
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Why isn't ionization energy called cationization energy? [closed]

I'm learning chemistry and ionization energy is "[...] the amount of energy required to remove the most loosely bound electron, the valence electron, of an isolated gaseous atom to form a cation." It ...
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Volume of orbitals

As I was learning about atomic structure, the lecturer made a seemingly dubious claim: The volume of a p orbital is one-third that of the s orbital. Thus, inter-electronic repulsions are ...
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The irregular trend in ionization enthalpy of 3d elements

The d block elements display several exceptional behaviours, and one of them is the irregular trend in ionization enthalpy of 3d elements. The reason given by my textbook is very confusing, which I'...
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Is the first ionization energy in oxygen slightly more than nitrogen?

Why is the first ionization energy in oxygen slightly more than nitrogen? In nitrogen: $\ce{[He] 2s^2 2p^3}$ In oxygen: $\ce{[He] 2s^2 2p^4}$ This tells me that it should be easier to remove an ...
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Abnormal ionisation energy trend: Group 13 and 14

I was going through some ionisation energy data, where I came across the following: Ionisation energy order for Group 13 and 14: B > Al ≈ Ga > In < Tl C > Si > Ge > Sn < Pb What could be the ...
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Ionization energy of beryllium

Suppose I have $\ce{Be^3+}$. What would be its 4th ionization energy? By trying to solve the issue I saw that its a "hydrogen-like" atom – means that beryllium left with only $1$ electron in his ...
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Rate the following ions in increasing ionization energy

Sr2+, Rb1+, S2-, P3- I believe it is P3- < S2- < Rb1+ < Sr2+ because it should be easier to take an electron away from the negatively charged ions, but I'm not sure about the Rb and Sr ...
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Order of second ionization energy for cations

Why is the correct order of second ionisation potential of $\ce{Li , Be , B , C }$ such as: $\ce{Be} <\ce C <\ce B <\ce{Li} $? I understand that $\ce{Li+}$ has a stable inert gas electronic ...
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What is the range of photon energies can be effectively used to split a diatomic molecule like hydrogen?

I saw photo-ignition of hydrogen-chlorine mixture using UV light on YouTube. Chlorine molecule bond dissociation energy is $\pu{2.51 eV}$ (bluish colour). Bromine molecule bond dissociation energy is ...
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Group 15 Ionisation Energies

I had a little confusion regarding ionisation energies. I get that in general, the second ionisation energy > first ionisation energy, due to increased effective nuclear charge on the second electron....
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What is the relation between ionization energy and electropositivity?

Electropositivity of an element is defined as a measure of element's ability to donate electrons while Ionization energy or Ionization potential is defined as the energy required to dispel a loosely ...
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Is there any mathematical formula for electron affinity and ionization potential?

I already know about the mathematical formula for electronegativity, but it requires the ionization potential and electron affinity. How can I can easily calculate the ionization potential and ...
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Why can the electron gain process be endothermic or exothermic whereas the ionistation process is always endothermic? [duplicate]

I know that this may seem a very silly question to some of you but please help me.I am extremely confused. PS:Sorry if you accidentally stumbled to this question.I can't find the appropriate tags
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Ionisation Energy vs First Ionisation Energy [closed]

It was stated in a textbook that the first ionisation energy is the minimum energy needed to remove one mole of electrons from one mole of gaseous atoms in their ground state Is there a difference ...
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Why does iron have an abnormally high ionization energy?

Along a period the ionization energy should increase because the atomic number is increasing, but there is negligible increase in shielding. However, $\mathrm{IE}_\ce{Mn} < \mathrm{IE}_\ce{Fe} > ...
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Estimation of pressure and kinetic energy density of stellar interior using kinetic theory of gases

In Physical Chemistry we are working a problem that is confusing. We started by calculating the pressure half way to the centre of the sun assuming that the interior consisted of ionized hydrogen ...
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What is the element with the greatest first ionization energy?

Identify the element with the greatest first ionization energy. (A) Ce (B) C (C) Cl (D) Ca (E) Cs The book says the correct answer is (B) with such an explanation: First ionization ...
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Ground state oxidation potential and Ionization potential from density functional theory (DFT)

Can someone please tell me how to calculate the ground state oxidation potential (GSOP)? I understand that according to Koopmans' theorem, the negative of HOMO can be considered as the GSOP. Is there ...
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Why flame color of salts is determined by metal

If a pure metal is heated up in a flame, we see it giving the flame a characteristic color, e.g. $\ce{Na}$ burns yellow. If a salt, e.g. $\ce{NaCl}$ or $\ce{Na2SO4}$, is heated up, resulting color to ...
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Why the ionization energy of Au is more than that of Cu?

As we go down the group from 3d to 5 d, size increases. Vanderwaal radius of Cu and Au is 140pm and 166pm respectively. Since Cu is smaller in size, ionization energy of Cu must be greater. Then ...
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Why is the common magnesium ion Mg(II) and not Mg(I) when the second ionization energy is higher than the first ionization energy?

The first ionization energy for magnesium is given as $\pu{737.7 kJ/mol}$, and the second ionization energy is $\pu{1450.7 kJ/mol}$. Given this information, doesn't it take $\pu{737.7 kJ/mol}$ to ...
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Comparing first, second, and third ionization energies between atoms

Among the elements boron, carbon, nitrogen, and magnesium, what are the first ionization energies from least to greatest? What about the second and third ionization energies? I understand the first ...
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How do atomic radius and nuclear charge influence ionisation energies?

This is actually a multiple choice question. Why is the first ionisation energy of neon higher than that of fluorine? A: Fluorine is more electronegative than neon B: Neon has a ...
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Why is the first ionisation energy of a sodium cation bigger than that of a neon atom?

I understand that the 1st ionization energy gets bigger for elements along a period from left to right and along a group from down to up. But why is the 1st ionization energy of $\ce{Na+}$ bigger ...
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Does electron shielding increase or stay constant moving LEFT to RIGHT across a period?

Does electron shielding increase or stay constant moving left to right across a period? I have read about both, and I just want to know which one is right. I believe that electron shielding remains ...
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Why do cations have higher ionization energies than neutral atoms?

I know that metals have low ionization energies and non-metals have high ionization energies, but once a metal/non-metal becomes a cation, why does the cation itself have a ionization energy higher ...
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Energy comparison between an atom and its ion

Is it possible to compare energy(enthalpy or similar) between an atom and its ion, possibly in the same state(gas)? For example, $\ce{O}$ and $\ce{O^+}$(intentionally cation), $\ce{Na}$ and $\ce{Na^+}...