12 points
How many formula units are in 12.50 g of NaCl? *

1.287 x 1028
1.287 x 10 23
1.214 x 1025
1.2 x 10 25

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

How many atoms are there in 5.70 mol of mg

Particles vibrate in a rigid structure and do not move relative to their neighbors.