Chemistry, 11.11.2020 21:10 jonellelewis2897
Which 2 elements have 2 valance electrons and are in the 4 periods of the periodic table.
1.sodium
2.Carbon
3.Berylirium
4.Calcium
Answers: 2
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What substance has a mass of 9.5g and volume of 2.1cm^3
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Answers: 1
Which 2 elements have 2 valance electrons and are in the 4 periods of the periodic table.
1.sodium<...
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