Electron Configuration Practice Worksheet In the space below, write the full ele

Question

Electron Configuration Practice Worksheet In the space below, write the full electron configurations of the following elements 1) sodium 2) iron 3) bromine 4) barium 5) neptunium In the space below, write the abbreviated electron configurations of the following elements: 6) cobalt 7) silver 8) tellurium 9) radium 10) lawrencium Determine what elements are denoted by the following electron configurations: 11) 1s22s22p63s23p4 12) 1s22s22p63s23p64s23d104p65s 13) [Kr] 5s24d105p3 14) [Xe] 6s 4f145d5 15) [Rn] 7s25f11 Determine which of the following electron configurations are not valid: 17) 1#2#2p63s*3d5 18) (Ra] 7s?5fs 19) [Kr] 5s24d 105p 20) [Xe]

Explanation / Answer

The electron configuration of the elements is based on the number of electrons present in the atoms of these elements.

So here , the electron configuration is given as :

1) sodium : 1s2 2s2 2p6 3s1

2) Iron : 1s2 2s2 2p6 3s2 3p6 3d6 4s2

3) bromine : 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5

4) barium :  1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s2

5) neptunium :  1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 5f4 6d1 7s2

To write the abbreviated electron configuration of the elements , the noble gas is denoted in the square brackets that preceeds the element in the periodic table (atomic number wise).

So here , the abbreviated electron configuration is given as :

6) cobalt : [Ar] 3d7 4s2

7) silver : [Kr] 4d10 5s1

8) tellurium : [Kr] 4d10 5s2 5p4

9) radium : [Rn] 7s2

10) lawrencium : [Rn] 5f14 7s2 7p1

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