Question

1. what element has the following electron configuration? 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵ mn v cr fe

Explanation:

Step1: Calculate total electrons

Add up the exponents of the electron - configuration. $2 + 2+6 + 2+6 + 2+5=25$.

Step2: Identify element by atomic number

The atomic number of an element is equal to the number of electrons in a neutral atom. The element with atomic number 25 is Manganese (Mn).

Answer:

A. Mn