Atomic Mass

Atomic mass is the mass of an atom, which is measured in atomic mass units (amu). It is a weighted average of the masses of all the isotopes of an element, taking into account the abundance of each isotope.

Calculating Atomic Mass

The atomic mass of an element is calculated by multiplying the mass of each isotope by its abundance, then adding the products together. The formula for calculating atomic mass is:

Atomic Mass = (Mass of Isotope₁ * Abundance₁) + (Mass of Isotope₂ * Abundance₂) + ...

Study Guide

What is atomic mass?

Atomic mass is the mass of an atom, measured in atomic mass units (amu).

How is atomic mass calculated?

Atomic mass is calculated by multiplying the mass of each isotope by its abundance, then adding the products together.

Why is atomic mass a weighted average?

Atomic mass is a weighted average because it takes into account the abundance of each isotope in nature.

◂Science Worksheets and Study Guides Second Grade. Magnets

Vocabulary/Answer key

Magnets

The resources above cover the following skills:

Core Ideas for Knowing Science

Physical Science

Objects can affect other objects at a distance.

Second Grade: Focus on Systems and System Models; Energy and Matter

Physical Sciences: Students develop an understanding of observable properties of matter and how changes in energy (heating or cooling) can affect matter or materials.

Physical Science Standards

Plan and carry out an investigation to determine that matter has mass, takes up space, and is recognized by its observable properties; use the collected evidence to develop and support an explanation.

Earth and Space Sciences: Students develop an understanding of the distribution and role of water and wind in weather, shaping the land, and where organisms live. Wind and water can also change environments, and students learn humans and other organisms can change environments too. Students develop an understanding of changing patterns in the sky including the position of Sun, Moon, and stars, and the apparent shape of the Moon.

Earth and Space Standards

Develop and use models to represent that water can exist in different states and is found in oceans, glaciers, lakes, rivers, ponds, and the atmosphere.

Analyze patterns in weather conditions of various regions of the world and design, test, and refine solutions to protect humans from severe weather conditions.