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Why chromium lose 1st e from 4s instead of 3d...??

Answer» Because half filled shells are more stable than another one
4s² $$\\boxed{↑\\↓}$$ 3d⁴ $$\\boxed{↑\\ \\|\\↑\\ \\|\\ ↑\\ \\|\\↑\\ \\| \\ \\}$$ hear 4s is full filled so it is stable but 3d is not stable
4s¹ $$\\boxed{↑\\ }$$ 3d⁵ $$\\boxed{↑\\ \\|\\↑\\ \\|\\ ↑\\ \\|\\↑\\ \\|↑\\ \\}$$ hear both 4s & 3d are more stable


wait, are you sure you areDeepak Singh ?
Yeah see the energy order of subshells
Bcoz it\'s more stable for them to have half-filled D-subshells ?


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