The smallest particle of an element that maintains the properties of that element.

• Proton

• Neutron

• Electron

• Atom

The average mass of one atom of an element (from particles in the nucleus)

• Atomic Mass

• Mass Number

• Atomic Number

• Nucleus Mass

The number of protons in the nucleus of an atom; used to determine an element's position in the Periodic Table

• Atomic Mass

• Atomic Number

• Mass number

• Electron cloud

A property of a subatomic particle; positive (protons), negative (electrons), or neutral (neutrons)

• Atomic number

• Element

• Reactivity

• Electrical charge

Tags

NGSS.MS-PS2-3

A negatively charged particle in the electron cloud surrounding the atomic nucleus

• Electron cloud

• Neutron

• Proton

• Electron

Tags

NGSS.MS-PS2-3

The negatively charged space containing electrons that surrounds the atomic nucleus

• Neutron Cloud

• Electron Cloud

• Proton Cloud

• Valence Electron

A pure substance that cannot be broken down chemically into simpler substances

• Element

• Atom

• Molecule

• Nucleus

A (neutral) particle with no electrical charge within the atomic nucleus

• Proton

• Electron

• Neutron

• Electron cloud

The positively charged center of an atom containing the protons and neutrons

• Nucleus

• Neutron

• Electron

• Electron cloud

A particle smaller than an atom, such as a proton, neutron, or electron

• Atomic number

• Atomic mass

• Subatomic particle

• Nucleus