What do the elements in each group have in common a block


1) Why are there only 8 elements in period 2 and period 3?

2) Why are there 18 elements in period 4?

3) What do the elements in each group have in common?

4) A block is formed by the 28 elements set off at the bottom of the periodic table. What do these elements have in common?

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Chemistry: What do the elements in each group have in common a block
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