Question

exam 1: atomic theory/structure
what is the nuclear composition of uranium - 235?
92 protons + 143 electrons
92 electrons + 143 protons
143 protons + 92 neutrons
92 protons + 143 neutrons

Explanation:

Uranium - 235 has atomic number 92 (92 protons). Mass number is 235. Neutrons = 235 - 92 = 143. Nucleus has protons and neutrons.

Answer:

D. 92 protons + 143 neutrons