Question

How many neutrons in 4.17×10²³ 13C atoms?
A) 7
B) 13
C) 20
D) 26

Answer 1

There are 7 neutrons in a carbon-13 atom.

Step-by-step explanation:

The number of neutrons in an atom can be calculated by subtracting the number of protons (which is the atomic number) from the mass number. Carbon-13 has a mass number of 13 and 6 protons, so the number of neutrons can be calculated as:

Number of neutrons = Mass number - Atomic number

Number of neutrons = 13 - 6 = 7