Minerals are chemically classified by their ____________________ ...

[leo leo]

Minerals are chemically classified by their ___________________ _ or ___________________ _. Fill in the blank(s) with the appropriate word(s).

Question 2

The two factors which determine whether or not an element can substitute for another element in the
  composition of a mineral are the ___________________ _ and ___________________ _ of the atoms. Fill in the blank(s) with the appropriate word(s).

[bobsmith]

Answer to Question 1

negative ion, ion group
ion group, negative ion

Answer to Question 2

size, charge
charge, size

[leo leo]

Thank you

[bobsmith]

No problemo