Question

What is the valency of atomic number 42 ? And how? ​

Answer 1

Answer:

Molybdenum is the element with atomic number 42 and is having electronic configuration [Kr]5s14d5, where atomic no. of Kr = 36. Thus no. of valence electrons is 1, which is no of an electron in 5s subshell.

Explanation:

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Answer 2

Molybdenum is the element with atomic number 42 and is having electronic configuration [Kr]5s14d5

how to find valency ⬇⬇⬇

The valency of an atom is equal to the number of electrons in the outer shell if that number is four or less. Otherwise, the valency is equal to eight minus the number of electrons in the outer shell. Once you know the number of electrons, you can easily calculate the valency.