Question

Give reason :
First period in the
in the meden period
table contains only two elements​

Answer 1

A period 1 element is an element in the first period (row) of the periodic table. ... Period 1 elements follows the duet rule, they only need two electrons to complete their valence shell. These elements can only hold two electrons, both in the 1s orbital. Therefore, period 1 can have only two elements.

Answer 2

Answer:

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Explanation:

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