Unit 3-The Atom

The tiny, dense, positive core of an atom.

• nucleus
• proton

• electron

• neutron

Tags

NGSS.HS-PS1-8

A negatively charged subatomic particle with a mass of 0.00055 amu.

• proton

• neutron

• electron

• nucleus

Tags

NGSS.HS-PS1-3

Atoms of the same element with a different number of neutrons.

• compounds

• isotopes
• elements

• nucleus

The sum of the protons and neutrons in the nucleus of an atom.

• mass number
• atomic number

• average atomic mass

• mass and atomic number

Tags

NGSS.HS-PS1-8

One-twelfth (1/12) the mass of a carbon-12 nucleus.

• Atomic mass unit
• mass number

• mass and atomic number

• atomic number

The force that binds the protons and neutrons together in the nucleus.

• Electromagnetic force

• Strong nuclear force
• Electrostatic force

• Gravity

Tags

NGSS.HS-PS1-8

The weighted average of the masses of an element's isotopes.

• atomic mass
• atomic number

• mass and atomic number

• electron

Tags

NGSS.HS-PS1-8

The number of protons in the nucleus of an atom.

• Atomic mass

• Atomic number

• Electron cloud

• Isotope

Tags

NGSS.HS-PS1-8

An atom with an overall charge due to missing or extra electrons.

• ion
• electron

• isotope

• positron

A positively charged subatomic particle with a mass of 1.007amu.

• electron

• proton
• neutron