Question

5)How many valence electrons are in an atom of Cl.
6)How many valence electrons are in an atom of K.
7)How many valence electrons are in an atom of Ar.

Answer 1

Answer:

5. the last shell of chlorine atom has 7 electrons in it. Therefore, there are 7 valence electrons present in an chlorine atom.

6.Atomic number of potassium atom is 19. Its electronic configuration is 2,8,8,1 so, its valency is 1.

7. eight valence electrons

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Answer 2

Answer:

5) 7 valence electrons

6) 1 valence electron

7) 8 valence electrons

Explanation:

5) Cl (17) has the electronic Configuration of:

2, 8, 7 or 1s^2, 2s^2, 2p^6, 3s^2, 3p^5.

6) K(19) has the electronic Configuration of:

2, 8, 8, 1 or 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^1.

7) Ar(18) has the electronic Configuration of:

2, 8, 8 or 1s^2, 2s^2, 2p^6, 3s^2, 3p^6.

Valence electrons are those electrons which are present in the outermost shell (a.k.a. valence shell)