Determine whether these are true or false. 1) The electron configuration of 1s 2

Question

Determine whether these are true or false.

1) The electron configuration of 1s22s22p63s23p34s13d2 is an excited state electron configuration for P.

2) If an element (abbreviated X) has a ground state electron configuration of [Ar]4s23d104p4, then the formula of the compound that X forms with sodium is NaX.

3)  The ground state electron configuration for the undiscovered element 118 is [Rn]7s25f146d107p5.

4) The expected ground state electron configuration for Os is [Xe]6s25d6.

5) The element with a ground state electron configuration of [Kr]5s24d105p5 has 7 valence electrons.

Explanation / Answer

1) false ,

P = 15 = [Ne] = 4s2 3p3

in exited state, P = 15 = [Ne] = 4s1 3p3 3d1

2) false

expecting it is Bromine, by Br = [Ar] 3d10 4s2 4p5

3) false

element = 118

E.C = 1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f146d107s27p6

      = [Rn]5f146d107s27p6

4) false

Os (osmium) = 76 : [Xe] 4f14 5d6 6s2

from equation : 1 mol 1-bromobutane = 1 mol NaOCH3

5) True, it has 7 valence electrons

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