Across
1: Period
5: Proton
Down
2: Electron
3: Neutron
More later, I've gotta do homework now :)
S- and P-Block elements are known as Representative elements.
Groups 1-2 and Groups 13-18
To calculate the atomic mass<span> of a single </span>atom<span>, add up the </span>mass<span> of protons and neutrons.
So, your answer would be A) add the number of protons and neutrons</span>
Liquid to solid and solid to liquid
