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An element will have lowest ionisation potential
P when its electronic configuration is

W
(1) \( 1 \mathrm{~s}^{1} \)
(2) \( 1 \mathrm{~s}^{2}, 2 \mathrm{~s}^{2}, 2 \mathrm{p}^{2} \)
(3) \( 1 \mathrm{~s}^{2}, 2 \mathrm{~s}^{2}, 2 \mathrm{p}^{5} \)
(4) \( \mathrm{Is}^{2}, 2 \mathrm{~s}^{2}, 2 \mathrm{p}^{6}, 3 \mathrm{~s}^{1} \)
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