Atomic Mass

Atomic mass is a property of an atom that represents the total mass of the protons, neutrons, and electrons in an atom. It is typically expressed in atomic mass units (amu).

Protons and Neutrons

Protons and neutrons are located in the nucleus of an atom. Protons have a positive charge, while neutrons have no charge. The total number of protons and neutrons in an atom is known as the mass number.

Electrons

Electrons have a much smaller mass compared to protons and neutrons, so they are often not included in the calculation of atomic mass. However, in some cases, the mass of electrons may be considered when determining the atomic mass of an atom.

Calculating Atomic Mass

The atomic mass of an atom is calculated by adding the total number of protons and neutrons. Since electrons have a very small mass compared to protons and neutrons, they are often not included in the calculation.

Study Guide

What is atomic mass?
Where are protons and neutrons located?
What is the mass number?
What is the charge of protons?
How is atomic mass calculated?

◂Science Worksheets and Study Guides First Grade. Human body

Vocabulary/Answer key

Human body

Vocabulary/Answer key

Human body

The resources above cover the following skills:

LIFE SCIENCE

From Molecules to Organisms: Structures and Processes

Design a solution to a human problem by using materials to imitate how plants and/or animals use their external parts to help them survive, grow, and meet their needs (e.g., outerwear imitating animal furs for insulation, gear mimicking tree bark or shells for protection).