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NEET levelSingle correct optionDifficulty 1 of 3pt006

An element has atomic number 20. Its group and period are

Agroup 2, period 3
Bgroup 2, period 4
Cgroup 4, period 2
Dgroup 12, period 4

Answer: B

The configuration is

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2}

. The highest shell is 4, giving period 4, and two electrons in the

s

orbital give group 2.

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