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If a certain element has an atomic numbe...

If a certain element has an atomic number 19, the element is

A

a metal with oxidation number +1

B

an inert gas

C

a non metal with oxidation number +3

D

a metal with oxidation number +3

Text Solution

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The correct Answer is:
A
The atomic number of K is 19. Its electronic configuration is 2 8, 8, 1. Its outer most orbit has 1 electron. It is metal and its oxidation number is +1.
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