В ионе XO₄³⁻ 50 электронов. Сколько электронов в атоме X имеют ml=0 и s=+½?

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📝 Detailed explanation

Электроны на X: 50 − 4·8 − 3 = 15 (фосфор). 1s²2s²2p⁶3s²3p³. С ml=0 и s=+½: 1s(1), 2s(1), 2pz(1), 3s(1), 3pz(1) — всего 5.
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