What is particle X?

• A) an alpha particle

• B) a beta particle

• C) a proton

• D) a positron

Tags

NGSS.HS-PS1-8

What is the volume shown in this graduated cyclinder?

• 24.0 mL

• 24 mL

• 23.7 mL

• 23 mL

In an atom, electrons move in definite orbits around the nucleus.

• Thomson
• Rutherford
• Bohr
• Democritus

What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Thomson
• Ernest Rutherford
• John Dalton
• Democritus

This is a correct dot diagram for fluorine (F)

• true
• false

Tags

NGSS.HS-PS1-1

It is a measure of how close measurements come to each other when they are made in the same way

• Accuracy
• Precision
• Error
• Extrapolation

What is the mass number defined as?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

Place the following scientists in order, from earliest to latest: 
Rutherford, Dalton, Bohr, Thomson

• Dalton, Rutherford, Bohr, Thomson
• Thomson, Dalton, Rutherford, Bohr
• Dalton, Thomson, Rutherford, Bohr
• Bohr, Dalton, Rutherford, Thomson

What atom matches this electron configuration?
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰

• Zinc
• Copper
• Nickel
• Germanium

Tags

NGSS.HS-PS1-1

Rutherford's gold foil experiment provided evidence that...

• negative and positive charges are spread evenly throughout the atom.
• alpha particles have a positive charge.
• gold is not a dense as previously thought.
• there is a dense positively charged nucleus at the center of an atom.