Magnesium is placed in period 3.
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1
Answer:
because shell in magnisium three and group because valency is two
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4
Answer:
hey mate
Explanation:
From sodium to chlorine, the bonding electrons are all in the 3-level, being screened by the electrons in the first and second levels. The increasing number of protons in the nucleus as you go across the period pulls the bonding electrons more tightly to it.
hope its help
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