Chemistry Crossword 2

1. A particle of electromagnetic radiation having zero rest mass and carrying a quantum of energy.
4. Together, all the forms of electromagnetic radiation form the ___________.
5. A state in which an atom has a higher potential energy than it has in its ground state.
6. Defined as the number of waves that pass a given point in a specific time, usually one second.
8. the weighted average of the atomic masses of the naturally occurring isotopes of an element
10. an element that is a good conductor of heat and electricity
12. The distance between corresponding points on adjacent waves.
14. atoms of the same element that have different masses
15. an element that has some characteristics of metals and some characteristics of nonmetals
16. the mass of one mole of a pure substance
17. number of protons in a nucleus
18. The minimum quantity of energy that can be lost or gained by an atom.

1. Refers to the emission of electrons from a metal when light shines on the metal.
2. general term of any isotope of any element
3. The lowest energy state of an atom
4. A form of energy that exhibits wavelike behavior as it travels through space.
7. the symbol of y
9. The amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon-12.
11. wave length symbol
13. the smallest particle of an element that retains the chemical properties of that element