The periodic table is a systematic arrangement of the known chemical elements in order of atomic number. The elements are arranged in groups on the basis of similarity in chemical and physical properties.
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Did Mendeleev predict the existence of neutrinos?
According to this Wikipedia page, Mendeleev originally believed that the inert gases belonged in Group 0 (to the left of the alkali metals). Thus, helium would be placed in the second period to the ...
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Why are elements on the right side of the periodic table nonmetallic and gas at room temperature?
Elements on the left side of the periodic table tend to be solid and metallic, elements on the right side of the periodic table are nonmetal and tend to be gases at room temperature, and the ...
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What is a “period” of the periodic table?
I'm familiar with the periodic table / periodic system, but I wonder why it's called "periodic" since there seems not much periodic about (there seems to be little or no predictability of which ...
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Is At a non metal or a metalloid?
Is Astatine a non metal or a metalloid?
A metalloid is an element which exhibits some of the properties of a metal as well as those of a non metal.
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Hydrogen - its place in the Periodic Table
Why do some people say that hydrogen should be above lithium in the periodic table and others argue it should be above fluorine?
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What information should be included in a periodic table? [closed]
I'm composing a periodic table with 2 paragraphs for each element. What are the essential properties of elements that most people would find useful?
Apart from element's name, Latin / Greek name, ...
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Periodic Trends
I was just wondering if anyone could help me by telling me the trends and why that trend exists in the periodic table for the following:
Atomic Size
Ionization Energy
Metallic Character
Positive ion ...
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Why does radium have a higher first ionisation energy than barium?
I'm wondering why radium appears to buck the general trend that first ionisation energies decrease as you move down a group in the periodic table: barium (the group 2 element preceding it) has a first ...
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Where can I find a downloadable spreadsheet of element properties?
Sorry for the FAQ, but I really don't know where to find a full spreadsheet for element properties. I mean a table that has one row for each element, and the columns are its properties, such as name, ...
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What are the g-block's predicted properties?
I have been researching for a Physics/Chemistry exam and thought; what will the future periods in the periodic table (periods 8 and above) would entail? Each block contains its own properties that ...
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Where did the rest of the elements come from?
There were ninety original elements on the Periodic Table. Over time, new ones were founded and put on. However, they were all either the original elements experimented on. For example, Plutonium was ...
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How can scientists be certain that there are no undiscovered elements missing from the periodic table from hydrogen to lawrencium?
Scientists are certain that there are no undiscovered elements missing from the periodic table from hydrogen to lawrencium. How? and why?
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Specific heat capacity and the periodic table
Can someone explain me how can I use the periodic table in order to find the specific heat capacities of some elements? (for example, of Aluminium )
The question I have encountered is as follows:
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Phase diagram for first 10 elements
I've been looking on the net for a reference which shows a phase diagram for elements at least from $\ce{H}$ up to $\ce{Ne}$. Specifically, I'm looking which of these elements can be solid or liquid ...
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Determining the exact charge of ions that will be formed by an atom using the periodic table
I don't know how to obtain the "exact charge of the ions" that will be formed by each atom mentioned. I also have to figure out whether they are positive or negative.
Hydrogen, for example, can form ...
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Is there a similar characteristic of the Lanthanide Contraction in the other transition metal groups?
Basically, does this also occur with the 4d, 6d groups as well? I am at a lack of understanding in this topic, I am just wondering what specific elements does this jump in a lower atomic radii occur. ...
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What are alternates to the Periodic Table of the Elements?
What are the different diagrams/tables used to organize the elements other than the Periodic Table? What are the advantages/disadvantages of each?
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Brittle d-block metal trend
I remember seeing a periodic table that had the top-left corner of the d-block shaded and marked as "brittle". If I recall correctly, the elements were $\ce{Sc,Ti,V,Cr,Mn,Y,Zr,Nb,La}$. I think (Sorry, ...
