1.03 Atomic Theory & Mass Review

Atoms are the building blocks of matter

• True
• False

Tags

NGSS.MS-PS1-1

Which scientist atomic model is similar to a chocolate chip cookie?

• Dalton
• Democritus
• Thomson
• Bohr

Thomson discovered negatively charged particles called

• neutrons
• electrons
• protons
• fermions

Tags

NGSS.MS-PS1-1

According to rutherford,

• The atom positive charge is at its center.
• most of the mass of an atom is concentrated at its center
• electrons move around the center of an atom
• all of the above

Tags

NGSS.MS-PS1-1

Each element has a unique number of

• protons
• electrons
• neutrons
• nucleons

Tags

NGSS.MS-PS1-1

Protons and electrons are almost identical in size and mass.

• True
• False

An element’s atomic number is equal to its number of

• protons
• electrons
• neutrons
• valence electrons

Tags

NGSS.MS-PS1-1

According to the modern atomic theory

• electrons move on orbits around the nucleus
• electrons are located in the nucleus of an atom.
• electrons are located on electron clouds
• electrons have definite paths

The 2 subatomic particles in the nucleus of an atom are the...

• Protons

• Neutrons

• Electrons

Tags

NGSS.MS-PS1-1

The ______ has the least mass of all the subatomic particles. It contributes very little to the overall atomic mass.

• Proton

• Neutron

• Electron

• Nucleus