atoms

2. the center of an atom
5. particle that has a negative (-) charge and is found outside the nucleus
7. Russian chemist who created the periodic table (page 61)
9. place in an electron cloud where an electron is most likely to be found
10. the number of protons in the nucleus of an atom
13. Atoms of two or more elements can join together to form ________. (page 54)
16. Atoms cannot be created or ____________. (page 54)
17. particle that has no charge and is found inside the nucleus
18. the smallest part of an element that can be identified as that element

1. shortened way of writing the name of an element
3. substance that cannot be chemically broken down into simpler substances
4. total mass of the protons and neutrons in an atom, measured in mass units (AMU)
6. particle that has a positive (+) charge and is found inside the nucleus
8. Greek philosopher who first suggested the idea of the atom (page 54)
11. number of protons and neutrons in the nucleus of an atom
12. Atoms of the same element are exactly ________. (page 54)
14. vertical (up and down) column of elements in the periodic table
15. horizontal (side to side) row of elements in the periodic table
16. English chemist who proposed the Atomic Theory (page 54)