U3 Atoms and Nuclear Chemistry Vocabulary Review

A negatively charged, fast-moving particle with an extremely small mass.

• atom

• neutron

• electron

• radioactivity

A neutral subatomic particle in an atom’s nucleus that has a mass nearly equal to that of a proton.

• isotope

• nucleus

• mass number

• nuclear radiation

Atoms of the same element with different numbers of neutrons.

• gamma ray

• proton

• atomic mass unit

• isotope

The number of protons in an atom.

• atomic mass

• alpha particle

• nuclear equation

• atomic number

Tags

NGSS.HS-PS1-7

The weighted average mass of the isotopes of that element.

• atomic mass

• alpha particle

• nuclear equation

• atomic mass unit

Tags

NGSS.HS-PS1-8

A subatomic particle in an atom’s nucleus that has a positive charge of 1+.

• proton

• neutron

• electron

• alpha particle

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

• atom

• nucleus

• mass number

• isotope

One-twelfth the mass of a carbon-12 atom.

• atomic mass unit

• atomic number

• mass number

• nuclear equation

The number after an element’s name or symbol representing the sum of its protons and neutrons.

• mass number

• atomic mass

• nuclear equation

• atomic number

The extremely small, positively charged, dense center of an atom that contains positively charged protons and neutral neutrons.

• nucleus

• atom

• mass number

• isotope

Tags

NGSS.HS-PS1-8