chemistry puzzle

2. all lithium atoms have _____ protons
5. an atom that has 2 protons is the element _____
9. the mass number of an atom that has two protons, two electrons, and two neutrons
10. Which subatomic particle has the smallest mass?
12. atoms that have the same number of protons but a different number of neutrons
15. center of an atom
17. isotopes have the same number of protons but a different number of ____
19. word that means "smaller than an atom"
20. an atom that has 1 proton is the element _____
24. if given a choice between the mountains or the beach, you would choose the _____
26. the elements are organized in the _____ table

1. the element that is used in some nuclear bombs
3. atoms with the same number of protons are the same _____
4. the mass number of an atom that has three protons, three electrons, and four neutrons
6. these animals can either be land animals OR water animals
7. a _____ average is an average based on how important each number is
8. Do all nitrogen atoms have the same number of protons?
11. an atom that has 8 protons is the element _____
13. the charge of a proton
14. the charge of a neutron
16. the amount of "stuff" in an object
18. most of an atom is _____ space
21. the mass number of an atom that has one proton, zero neutrons, and one electron
22. the charge of an electron
23. Do positive and negative charges attract each other, or do they repel?
25. an atom that has 5 protons is the element _____