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Across
3.The electrons in the outmost energy level of an atom
6.Are unreactive nonmetals
8.The steel trowel below reacted with oxygen
10.The weighed average of the masses of all the naturally occuring isotopes
11.Positively charged particles
15.Elements that have properties of both metals & nonmetals
17.Are soft enough to be cut with a knife
19.SI unit for the masses of particles in atoms
Down
1.Are not as reactive as Alkali Metals
2.Particles of the nucleus that have no charge
4.Negatively charged particles
5.Indicates the physical states at room temperature
7.Is a dark red liquid
9.Number of protons in the nucleus
12.A tiny,very dense,positely charged region
13.Are very reactive nonmetals
14.Same number of protons,different number of neutrons
16.Is a yellowish green gas
18.Is a dark gray solid
19.Is the smallest particle

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