Oct 26, 2021 · The other exception is hydrogen. It has only one s-electron and hence can be placed in group 1 (alkali metals). It can also gain an electron to achieve a noble gas …

Apr 29, 2012 · The two hydrogens are the same, but some periodic tables show hydrogen in both places to emphasize that hydrogen isn't really a member of the first group or the seventh …

Oct 2, 2021 · Is hydrogen or helium the smallest atom? My teacher said that the smallest atom is the helium atom, but I think that the smallest atom is the hydrogen atom. It has a single …

Jul 16, 2017 · Nevertheless there is strong analogy between the electronic structure of hydrogen and the alkali metals which motivates hydrogen being often placed in this group. Periodic table …

Jul 23, 2016 · There is a lot that could be said about this question, but a simple explanation goes like this: Some periodic tables categorize hydrogen as a metal (or at least an alkali metal) …

Oct 28, 2012 · Scientists are certain that there are no undiscovered elements missing from the periodic table from hydrogen to lawrencium. How? and why?

Feb 27, 2014 · It seems related to the atomic size but hydrogen has a smaller atomic size than fluorine. Why is fluorine the most electronegative atom?

May 16, 2018 · I understand that the way to calculate the atomic mass is to obtain a weighted average of the masses of all the isotopes of an element. I also understand that there are about …

Jan 15, 2020 · Now to answer your question, there is no way of obtaining the physical state from the periodic table. Simply speaking, you should here know that pure $\ce {HCl}$ is a gas at …

Sep 8, 2014 · While I was looking at the periodic table today, I realised that there were gases that were much lighter than helium such as hydrogen. If hydrogen is lighter than helium, why do we …