elements may be represented by chemical symbols;
No resources have been tagged as aligned with this standard.
An atom’s identity is directly related to the number of protons in its nucleus. This is the basis for the arrangement of atoms on the periodic table of elements.
Atomic mass is equivalent to the number of protons and neutrons in the atom of an element (PS.4 a).
Although an element’s atoms all have the same number of protons, they can have different numbers of neutrons (PS.4 a).
groups/families vs. periods.