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JEE Advanced levelSingle correct optionDifficulty 3 of 3pt054

An element has atomic number 43. Its group and period are

Agroup 5, period 4
Bgroup 7, period 5
Cgroup 7, period 4
Dgroup 17, period 5

Answer: B

Krypton has

Z = 36

, so 7 more electrons go into 5s and 4d:

[Kr] 4 d^{5} 5 s^{2}

. The highest shell is 5 so period 5, and group

= 5 + 2 = 7

.

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