Table of contents

2. Atoms & Elements

Atomic Mass

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

What is the mass number of an atom with 5 protons and 7 neutrons?

Verified step by step guidance

Identify the number of protons in the atom, which is given as 5. The number of protons is also known as the atomic number.

Identify the number of neutrons in the atom, which is given as 7.

Understand that the mass number of an atom is the sum of the number of protons and neutrons in the nucleus.

Use the formula for mass number: \( \text{Mass Number} = \text{Number of Protons} + \text{Number of Neutrons} \).

Substitute the given values into the formula: \( \text{Mass Number} = 5 + 7 \).

Master Atomic Mass with a bite sized video explanation from Jules

Problem sets built by lead tutors

Expert video explanations