Число протонов, нейтронов и электронов в атоме калия :

1) p+ – 19; n0 – 20; ē – 19
3) p+ – 20; n0 – 19; ē - 20
2) p+ – 19; n0 – 20; ē – 39
4) p+ – 19; n0 – 19; ē - 19
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