Question

An atom in an element has 1 electron in the valence shell
and the two inner shells have 8 electrons each. Find the
atomic number of that element.
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Answer 1

Answer:

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Explanation:

Electronic configuration of an element is 2

n

where n is the number of orbit hence

1st orbit can not have more than 2 electrons 2

1

=2

2nd orbit can not have more than 8 electrons 2

2

=8

Electronic configuration of an element can be 2,8,8,1=19

Answer 2

Explanation:

Electronic configuration of an element is 2^n

where n is the number of orbit hence

1st orbit can not have more than 2 electrons 2^1 =2

2nd orbit can not have more than 8 electrons 2^2=8

Electronic configuration of an element can be 2,8,8,1=19

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