Q. 75.0( 5 Votes )

The position of e

Answer :

(i) The atomic number of calcium Ca =20

The Electronic configuration of Ca is 2, 8, 8, 2

(ii) Since Rb belongs to 1st group therefore Rb has one valence electron.

(iii) Sr (38) belongs to 5th period. Therefore, Sr has 5 shells.

(v) K belongs to 1st group which means that it has one valence electron and therefore it can donate the electron and attain stable gas configuration. Therefore, it is a metal.

(v) The largest atom in size is Rb.

(vi) The Increasing order of the atomic size of the respective atoms is as follows:

Be < Mg < Ca < Rb

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