Question

Question #3df7e

Answer 1

Most likely 3 3d electrons.

Explanation:

Chromium is number 24 so the neutral atom starts with 24 electron.

18 of these electrons are found in the 3rd shell `1s^2 2s^2 2p^6 3s^2 3p^6`

This leaves 6 valance electrons.. Three of these electrons have been lost leaving three valance electrons.

Generally transition metals lose the `4s^2` electrons first. So the 2 4s electrons and 1 3d electron would most likely be lost leaving 3 electrons in the 3d orbitals.