Question

how many protons (p) and electrons (e) are found in a se²⁻ ion? answer: a 34 p, 36 e b 34 p, 32 e c 32 p, 34 e d 36 p, 34 e e 34 p, 34 e

Explanation:

Step1: Determine proton number

The atomic number of selenium (Se) is 34. The number of protons is equal to the atomic number. So, the number of protons in $Se^{2 -}$ is 34.

Step2: Determine electron number

A neutral Se atom has 34 electrons (equal to the number of protons). The $Se^{2 -}$ ion has a 2 - negative charge, which means it has gained 2 electrons. So the number of electrons is $34 + 2=36$.

Answer:

A. 34 p, 36 e