The lowest oxidation number of an atom in a compound $\mathrm{A_2B}$ is $-2$. The number of electrons in its valence shell is ________.

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JEE Main 1 February 2024, Shift 1, Chemistry Q84

Question 84 of 90 in this shift, Chemistry question 24 of 30, Section B.

The lowest oxidation number of an atom in a compound

\mathrm{A_2B}

-2

. The number of electrons in its valence shell is ________.

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