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Q.

Write atomic number difference between 1st alkali metal and alkali earth metal of 4^th period of periodic table

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answer is 17.

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Detailed Solution

1st alkali metal (Li) ,atomic number =3

Alkaline earth metal (4th period) =Ca(atomic number= 20

Difference between 1st alkali metal and alkali earth metal of 4^th period of periodic table = 20-3 =17

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Write atomic number difference between 1st alkali metal and alkali earth metal of 4th period of periodic table