Question

How many electrons are present in the valence shell of the atomic number 19?

Answer 1

Answer:

potassium will have 2,8,8,1

Answer 2

Answer:

19 will have electronic configuration= 2,8,8,1

hence the number of electrons present in the outer most shell=1

(or)

element with At.No=19 will have configuration= [ 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^1 ]

hence the last shell is 4s which has  1 electron.

thus, by both ways the answer is 1.

hope it helps you

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