what is the electron configuration of the ff. elements?

Question

1.K
2. S
3.Kr
4. Ba

Answer 1

K 1s2 2s2 2p6 3s2 3p6 4s1

S 1s2 2s2 2p6 3s2 3p4

Kr 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6

Ba 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s2

Answer 2

Things to remember:
Order of orbitals to fill by the Aufbau Principle:
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, etc.

s holds 2 electrons, p holds 6, d holds 10, f holds 14

1. K has 19 electrons.
1s^2 2s^2 2p^6 3s^2 3p^6 4s^1

2. S has 16 electrons.
1s^2 2s^2 2p^6 3s^2 3p^4

3. Kr has 36 electrons.
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6

4. Ba has 56 electrons
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2

Answer 3

1.no. of electron for K = 19
Electronic config = 2,8,8,1

in spdf notation : 1s2 2s2 2p6 3s2 3p6 4s1

2.no. of electron for S = 16
E.C. = 2,8,6 or 1s2 2s2 2p6 3s2 3p4

3. Kr = 36
E.C. 2,8,8,8,8,4 or 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6

Answer 4

See link below, it contains great info:

http://www.chemicool.com/elements/sulfur.html