Match the key terms with the descriptions provided. (a)  a member of one of the B group...

Match the key terms with the descriptions provided.

(a)  a member of one of the B groups of elements in the periodic table

(b)  a law stating that all samples of a pure compound always contain the same proportions of the component elements

(c)  a negatively charged subatomic particle

(d)  an ion with a negative charge

(e)  a neutral particle consisting of two bound atoms

(f)  any element in group VIIIA (18)

(g)  a set of elements in the same horizontal row in the periodic table

(h)  the number of protons in an atom

(i)  the unit of mass used to describe single atoms or small numbers of atomic particles, which is equal to one-twelfth the mass of a carbon-12 atom

(j)  a set of elements in the same vertical column in the periodic table

(k)  any element in group IIA (2)

(l)  the central core of the atom, which contains the protons and neutrons, and most of the mass of the atom