The d subshell can hold up to 10 electrons in an atom. true false

TRUE

Explanation:

Each electronic shell in an atom is composed of subshells, which are denoted by the symbol s, p, d and f. These subshells are represented by the principal quantum number (n) and the azimuthal quantum number (ℓ).  

Each subshell can hold a fixed number of electrons, which is equal to (4ℓ + 2) electrons.

For, d subshell the value of ℓ = 2.

Therefore, the maximum number of electrons that a d-orbital can hold = (4ℓ + 2) electrons = (4×2 + 2) electrons = 10 electrons.

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