Help me please with 1, 2 and 3

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asked Apr 13, 2023 192k views

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MoustafaS · Answer 1 · 2023-04-20T01:32:59+0000

Answer:

1. Cobalt,Calcium,strontium

2.Elements in the same period generally have the same number of electron shells in the outermost energy level.
3.elements in the same period are chemically different.

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Help me please with 1, 2 and 3

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