the smallest particle of an element that retains all the properties of that element; is electrically neutral, spherically shaped and composed of electrons, protons, and neutrons

• atom

• electron

• nucleus

• neutron

Tags

NGSS.MS-PS1-1

the number of protons in an atom

• atomic number

• mass number

• atomic mass

• atomic mass unit

a negatively charged, fast-moving particle with an extremely small mass that is found in all forms of matter and moves through the empty space surrounding an atom's nucleus

• electron

• proton

• neutron

• nucleus

atoms of the same element with different numbers of neutrons

• isotope

• nuclear equation

• nucleus

• atom

the number after an element's name, representing the sum of its protons and neutrons

• mass number

• atomic mass

• atomic mass unit

• atomic number

a neutral, subatomic particle in an atom's nucleus that has a mass nearly equal to that of a proton

• neutron

• proton

• electron

• nucleus

Tags

NGSS.HS-PS1-8

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

• nucleus

• protons

• electron

• neutron

Tags

NGSS.HS-PS1-8

a subatomic particle in an atom's nucleus that has a positive charge of 1+

• proton

• electron

• neutron

• nucleus

Tags

NGSS.HS-PS1-8

Who was the first person to study atomic theory?

• Dalton
• Democritus
• Chadwick
• Miller

What quantities vary between isotopes of an element?

• protons, electrons, and atomic mass
• protons, electrons, and atomic number
• neutrons and electrons
• neutrons and atomic mass