The sum of period ànd periodicity of 5.123 bar
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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.
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