8. The number of
10.
9. The electric charge on an atom is neutral because the number of protons is the same as
the number of
and each of their individual charges cancel out.
are atoms of the same element with a different number of neutrons.
number.
11. What does it mean when a nucleus is "stable?"
13. What is alpha decay?
is different for each element and is known as the
12. If a nucleus is unstable and breaks apart, it is called
14. What is beta decay?
15. What is gamma decay?