What is defined as the number of atoms surrounding an atom in a crystal lattice and indicates how tightly the atoms are packed together

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.