Question

..How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?

Answer 1

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In the modern periodic table, atoms with similar electronic configurations are placed in the same column.

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• In a group, the number of valence electrons remains the same.

• Elements across a period show an increase in the number of valence electrons.

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Answer 2

Answer:

The electronic configuration of the like Na: 2,8,1

in this it has three shells and as we can count also so it will in third period and it has 1 electron in it's outermost shell so it is in 1st group and the the number of valance electron counted as valency. so it has 1 valency.

Explanation:

i hope this will help you ....