Question

an uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. how many neutrons does boron have? 2 5 11 11

Explanation:

Step1: Recall atomic structure facts

In an un - charged atom, number of protons = number of electrons. Atomic number = number of protons. Given atomic number of boron is 5, so number of electrons is 5. Atomic mass = number of protons + number of neutrons. Given atomic mass is 11 and number of protons is 5, so number of neutrons = 11 - 5=6.

Answer:

6