Question

The sum of period ànd periodicity of 5.123 bar

Answer 1

A period is a horizontal row of the periodic table.

There are seven periods in the periodic table, with each one beginning at the far left.

A new period begins when a new principal energy level begins filling with electrons.

Eg. Period 1 has only two elements (hydrogen and helium),

while periods 2 and 3 have 8 elements.

Answer 2

Answer:

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