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Help me please with 1, 2 and 3

Help me please with 1, 2 and 3-example-1

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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.

Step-by-step explanation:

User MoustafaS
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