Atomic Structure and Properties

What is the smallest unit of matter that cannot be broken down?

• force

• atom

• nucleus

• velocity

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

What is the quantity of matter contained in an atom of an element called?

• luminosity

• group

• percipitate

• atomic mass

This number represents the number of protons found in one atom of an element. What is is called?

• atomic number

• valence electron

• reactant

• atomic mass

What is a well-defined direction in a molecule that can be used to describe its symmetry called?

• speed

• electron

• axis

• element

When multiple forces act on an object are equal in magnitude but opposite in direction, canceling each other out and resulting in no net force. The forces are balanced and there is no change in motion.

• Law of Inertia

• reactant

• coefficient

• balanced force

A tool used to represent compounds in chemical equations that uses chemical symbols and numbers to express the relative proportions and types of elements in a compound molecule.

• chemical formula

• energy transformation

• subscript

• valence electron

A whole number written in front of a chemical formula in a chemical equation, indicating how many molecules of the substance are involved in the reaction.

• group

• period

• neutron

• coefficient

Tags

NGSS.MS-PS1-5

A substance made up of two or more different chemical elements combined in a fixed ratio.

• subscript

• compound

• element

• group

Tags

NGSS.MS-PS1-1

What is a stable subatomic particle with a negative electrical charge?

• nebula

• electron

• proton

• nucleus

Tags

NGSS.MS-PS2-3

What is a pure substance in which all atoms have the same number of protons?

• reactant

• proton

• element

• galaxy