More science Crossword
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Down:
1) diatomic molecule2) not like metals3) dangerous5) center of atom, all mass of atom in here6) can gain, lose, share 4 electrons7) don't trade electrons8) # of protons10) # of electrons12) gray, hard, never combined14) positive, in nucleus15) 219) mass #- atomic # |
Across:
4) negative, outside nucleus9) malleable, ductile, shiny11) Nitrogen gas makes up about 78% of the atmosphere on Earth but only 3% of the atmosphere on Mars.13) has properties of both metals/non metals16) less reactive then other metals17) shiny, soft18) in nucleus, no charge20) 8 |
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