23
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Will adding up protons and electrons (without neutrons) create a new element?
Yes and no.
Elements are defined by the number of protons only. It does not matter if (say) a carbon nucleus has six or seven (or eight) neutrons, they will all react the same.*
With that, to create ...
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20
votes
Will adding up protons and electrons (without neutrons) create a new element?
Jan's answer is correct. I will try to fill in a few details about why neutrons are essential to creating stable nuclei.
All stable isotopes excepting Hydrogen-1 have neutrons in their nuclei. ...
- 443
17
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Protons and the Heisenberg principle
But in the case of protons, we are kind of certain about their
position in the atom.
Well, yeah, kind of certain. The very notion of molecular geometry arises in the Born-Oppenheimer approximation. ...
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16
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Why is it that protons and electrons undergo the same amount of deflection in an electric field if they have the same energy?
Now that's a mildly non-trivial observation. Why would they be equal, really?
Let's say a particle with mass $m$, charge $q$, and initial velocity $v$ enters an area of length $L$ where an electric ...
- 31k
9
votes
Will adding up protons and electrons (without neutrons) create a new element?
I'll focus on the nucleus only. As far as I'm aware, there is little to no variation in radioactive decay lifetimes as a function of ion charge state; that is to say that the number of electrons ...
- 8,289
9
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Why does radioactive matter decay in series of half-lives?
There are fewer decays because there are fewer atoms to decay
The simple reason why the number of decays (strictly, the number of decays per unit time) decreases in simple radioactive decay is ...
- 35.4k
7
votes
Accepted
How right is defining elements with the number of protons?
Most of chemistry doesn't care a whit about all of the properties you named: they're in the realm of nuclear physics, as noted by user badjohn. Even radioactive decay is something of a black sheep, ...
- 17.3k
6
votes
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Proton leak during ATP synthesis
This occurs during Oxidative phosphorylation and the "proton leak" process is also called Uncoupling of Oxidative Phosphorylation
The mitochondrial electron-transport chain
Electron ...
- 5,084
6
votes
Is an acid (just) a proton donor and if not, what is the correct definition of an acid?
Your teacher said that this is not completely correct as there are (at least) three common definitions for acids and bases (Wiki has a good article for this https://en.wikipedia.org/wiki/...
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6
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Alternative to a proton
Your example with deuterons is unfortunate as they are composed of protons and neutrons and, as such, formally putting deuterons together would just reconstruct the periodic table we know. However, ...
- 28.3k
5
votes
What is the proton NMR spectrum of p-methoxyphenol?
In theory, this structure is expected to provide four different signals:
a broad singlet, due to the potential exchange of the phenolic OH
a singlet accounting for three protons of the methyl group
...
- 28.4k
5
votes
Why does radioactive matter decay in series of half-lives?
It is a general principle, not limited to nuclear chemistry, but is common for many areas, e.g. for the reaction kinetic of the 1st order.
All processes, where the value time rate is proportional to ...
- 39.1k
5
votes
Accepted
What does it mean to accept or donate a proton?
Donate a proton (acting as an acid)
A covalent bond with hydrogen breaks, hydrogen leaves without electrons (as a hydrogen ion, sometimes called proton as a shorthand), and the two electrons from the ...
- 39k
5
votes
Neutron–proton ratio and isotope stability
In context of this answer, stable means not undergoing a radioactive decay, regardless of the value of measured half-life.(+)
For light nuclei till about 40 nucleons, the neutron/proton ratio of ...
- 39.1k
5
votes
NH protons not appearing in H NMR spectrum of 3,4-dihydropyrimidone derivative (solvent: CDCl3)
As indicated by @Waylander, your compound may undergo keto-enol tautomerism. Beside a sample which may contain varying concentrations of three compounds (top row), ...
- 28.4k
4
votes
Will adding up protons and electrons (without neutrons) create a new element?
Without getting into the specifics of nuclear forces, there is a simple way to think about this.
What matter for chemistry is the number of protons in the nucleus of the atom as this determines the ...
- 35.4k
4
votes
How does one find the probability of tunneling along a reaction coordinate computationally?
If the reaction coordinate $\xi$ can be expressed as the change in the relative position between two groups of the molecule (e.g. for instance as a change in a bond length so that $\xi$ is given in ...
- 2,396
4
votes
Accepted
Effective Nuclear Charge of Noble Gases
I think that this is basically an accounting problem. The full electron configuration of $\ce{Ne}$ is: $1s^22s^22p_x^22p_y^22p_z^2$. So, what does one now define as core electrons? It could be: "all ...
- 6,851
4
votes
Can it be said that on our planet we have roughly the same number of electrons as we have protons?
Yes
We can see that the charges in the observable world are close to balance by considering what we would observe if they were not.
Big imbalances of charges cause strong electrical fields. Those ...
- 35.4k
4
votes
Accepted
In helium-2, would each electron experience a single positive charge from the nucleus?
To answer this question, I am going to assume that a $\ce{^2He}$ nucleus actually exists long enough for two electrons to surround it — this is probably not a valid assumption since Webelements.com ...
- 67.3k
4
votes
Accepted
Is the reaction of calcium carbide with water a Brønsted-Lowry acid-base reaction or Lewis acid-base reaction?
We may regard the calcium hydroxide and calcium carbide as essentially ionic except for the covalent bonding within the anions. So there is no Lewis reaction involving the calcium.
That leaves the ...
- 53.1k
4
votes
Accepted
How to experimentally measure number of protons or electrons in an element?
Moseley measured the atomic number in 1913 with relatively modest equipment (by modern standards) but I doubt that you could reproduce his experiments in a typical kitchen.
Atomic number at ...
- 818
4
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Chemistry: A Chemical Dilemma
You have it a little backwards. We don't observe charge, and then infer the existence of a force. It's the other way around. We observe forces between objects -- they repel or attract each other -- ...
- 1,663
4
votes
Why are the protons in the nucleus not repelled by each other?
Protons in nucleus no doubt are repelled by each other. But we know that an atom is stable. The reason for this is that the protons and the neutrons(together called nucleons) are attracted to each ...
- 66
4
votes
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Why did J.J. Thomson observe protons in his cathode ray experiment?
Thompson observed more than just cathode rays.
He experimented with different gases and different pressures in his tubes. When there is a significant amount of hydrogen you get ionisation of the gas ...
- 35.4k
4
votes
Accepted
Is water hydronium and hydroxide?
If there are arrows going both ways then that means it’s in equilibrium between the right side (products) and the left side (reactants).
It doesn’t mean that water is a mix of H3O+ and -OH, a vast ...
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4
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Hydrogen Isotopes and Bronsted Lowry Acid
Just remember that titles and names do not matter for elements or atoms. As Shakespeare wrote "What's in a name? That which we call a rose, by any other word would smell as sweet." An ...
- 38.9k
4
votes
Measurement of the number of electrons, protons and neutrons inside an atom
There are no techniques that directly count the number of electrons, protons and neutrons in an atom. All deductions about basic atomic structure were established indirectly, well before the 1940s ...
- 38.9k
3
votes
In helium-2, would each electron experience a single positive charge from the nucleus?
First of all, helium-2 is an extremely short-lived species - if you wanted to speak about its existence at all. So I assume that you had a more stable isotope in mind, e.g. helium-3 or helium-4.
......
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Only top scored, non community-wiki answers of a minimum length are eligible