Rutherford discovered the...

• electron
• proton
• neutron
• nucleus

Tags

NGSS.HS-PS1-8

an element will always have the same number of 

• neutrons
• protons
• isotopes
• atoms

Tags

NGSS.MS-PS1-1

Which particle does not contribute mass to the atom?

• Proton
• Neutron
• Electron
• Nucleus

What scientist is best known for his gold foil experiment?

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

An atom has 10 protons and a mass of 18. It has __ neutrons

• 10
• 18
• 28
• 8

Tags

NGSS.MS-PS1-1

The smallest particle into which an element can be divided and still be the same substance

• neutron
• atom
• electron

Tags

NGSS.MS-PS1-1

The mass number of an element that has18 protons, 18 electrons, and 19 neutrons is _____.

• 12.5
• 13
• 25
• 37

Tags

NGSS.MS-PS1-1

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

Tags

NGSS.MS-PS1-1

Who came up with the model of an atom pictured?

• J.J. Thompson
• Ernest Rutherford
• Neils Bohr
• James Chadwick

Tags

NGSS.MS-PS1-1