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Across
1.This element has the lightest atomic weight
3.This element normally has 7 electrons
5.These are the results of a chemical reaction
8.This element has an atomic number of 8
10.This type of reaction absorbs energy
12.This particle has the same mass as neutrons
13.These are the ingredients of a chemical reaction
14.This particle has an electrical charge of zero
15.This element is represented by the symbol 'Cl'
17.This element has 13 protons and 13 neutrons in the nucleus
19.This element has an atomic number of 80
21.This particle is the smallest of the atom
23.This element normally has 53 electrons
24.This element is represented by the symbol 'Si'
25.The electron reside in this part of the atom
26.This element has an atomic number of 11
Down
2.This reaction breaks apart water molecules in to hydrogen and oxygen gas
4.This element has 20 protons in the nucleus
6.This element would have 30 electrons if it gained 1 electron
7.The products of this reaction are soot, carbon dioxide, and water
9.This element has an atomic weight of 39.0983
10.This type of reaction releases energy
11.This element is the 2nd noble gas
16.Protons and neutron reside in this part of the atom
18.This element has 92 protons in the nucleus
20.This element has an atomic weight of 20.1797
22.This element has 2 protons in the nucleus

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