Question

name the elements in correct order of the increasing atomic numbers present in the first second and third short periods of the periodic table state each elements electronic configuration​

Answer 1

Answer:

Hey Buddy here's ur answer

First period contains 2 elements (Hydrogen and Helium) which has atomic numbers 1 and 2 respectively

.

Second period contains 8 elements (Li, Be, B, C, N, O, F, Ne) which as atomic numbers 3, 4, 5, 6, 7 and 8 respectively.

Third period contain 8 elements (Na, Mg, Al, Si, P, S, Cl, Ar) which has atmoic numbers 9, 10, 11, 12, 13, 14, 15 and respectively.

Answer 2

Answer:

First period contains 2 elements which is hydrogen and helium which has atomic numbers 1 and 2 respectively.

Second period contains 8 elements:-

-Lithium

-Beryllium

-Boron

-Carbon

-Nitrogen

-Oxygen

-Fluorine

-Neon

All this numbers has atomic numbers which are 3,4,5,6,7 and 8 respectively.

Third period contains 8 elements sodium,magnesium,aluminum,silicon,phosporus,sulphur,chlorine,argon.

They has atomic numbers which is 9,10,11,12,13,14 and 15 respectively

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