Question

write down the electronic configuration of k and cl​

Answer 1

Answer:

Potassium has a single valence electron, 4s1, which comes from the 4s subshell. Chlorine has a total of seven valence electrons, 3s2 3p5, two from the 3s subshell and five from the 3p subshell.

Explanation:

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Answer 2

Answer:

Potassium is forst element of period 4. Electronic configuration of potassium is 1s

2

2s

2

2p

6

3s

2

3p

6

4s

1

and also [Ar]4s

1

where [Ar] is 1s

2

2s

2

2p

6

3s

2

3p

6Based on the periodic table, the atomic number (

Z

of chlorine is 17. Since the atomic number is always equal to the number of protons or

Z

= number of protons

and in ground state (no charge), the number of protons is equal to the number of electrons, then

Z

= number of protons = number of electrons (ground state)

Therefore, the ground state electron configuration of the element, chlorine is:

1

s

2

2

s

2

2

p

6

3

s

2

3

p

5

=

17 electrons

(just add the superscripts)

For a ground state element to become an ion, it has to either gain or lose an electron in its outermost orbital. Elements usually do this in order to gain the electron stability of the noble gases (octet rule).