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JAMB Chemistry 2015 Paper

Question : 48

Total: 64

Electronic configuration of an element 13 in the subsidiary energy level is

Solution:

Concept:

The electron configuration of an element is determined by its atomic number, which equals the total number of electrons.

Explanation:

Element 13 has atomic number 13, so it has 13 electrons.

Electrons fill subshells in order of increasing energy:

1s^2

2s^2

2p^6

, then

3s^2

, then

3p^1

Total electrons:

2 + 2 + 6 + 2 + 1 = 13

Thus, the configuration is

1s^2\,2s^2\,2p^6\,3s^2\,3p^1

Answer:

1s^2\,2s^2\,2p^6\,3s^2\,3p^1

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