10. Give the atomic number and name of the element which has twice as many electrons in
its third shell as in its first shell.
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Answer:highest number of electrons in first shell = 2.
Twice of 2 is 4.
And highest number of electrons insecond shell is 8.{ By octate rule and electronic configuration.(2,8,18,32)}.
Therefore configuration is
2,8,4.
2+8+4= 14.
Therefore atomic number is 14.(silicon).
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