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The electronic configuration of elements...

The electronic configuration of elements are given below.
A = `1s^2`, `2s^2`, `2p^6`, `3s^2`, `3p^6`, `4s^2`
B = `1s^2`, `2s^2`, `2p^6`, `3s^2`,`3p^5`
The formula of ionic compound that could be formed between two elements is

A

`A_2B`

B

`AB_2`

C

`AB_5`

D

`A_5B_2`

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