Question

a nucleus has 11 protons and 12 neutrons. what is its (a) atomic number? blank1 - numeric answer type your answer here (b) atomic mass number? blank2 - numeric answer type your answer here

Answer 1

The atomic number of a nucleus with 11 protons is 11, and the atomic mass number is the sum of protons and neutrons, which equals 23.

Step-by-step explanation:

a. The atomic number of an element is equal to the number of protons in the nucleus. In this case, the nucleus has 11 protons, so the atomic number is 11.

b. The atomic mass number of an element is equal to the number of protons plus the number of neutrons in the nucleus. In this case, the nucleus has 11 protons and 12 neutrons, so the atomic mass number is 11 + 12, which is 23.