Atomic Structure

Most of the mass in an atom is made up of _____________________?

• protons and electrons

• protons and neutrons

• neutrons and electrons

• electrons and quarks

His model of the atom was referred to as the "plum pudding" model.

• Democritus

• John Dalton

• J.J. Thomson

• Ernest Rutherford

What scientist is best known for his gold foil experiment, which led to the discovery of the atomic nucleus?

• J.J. Thomson

• Ernest Rutherford

• John Dalton

• Democritus

What is the name of the Greek philosopher who was credited as the first person to think that the atom was the smallest unit of matter?

• J.J. Thomson

• Ernest Rutherford

• John Dalton

• Democritus

What do neutrons most contribute to in an atom?

• Atomic Number
• Charge
• Mass
• Nothing

Tags

NGSS.HS-PS1-7

How many neutrons does Si contain? (click to see image)

• 14

• 28

• 2

• 4

How are the elements in the periodic table arranged?

• by their atomic mass
• by their chemical symbol
• by their chemical name
• by their atomic number

what does the 6 represent?

• Atomic mass
• atomic number
• chemical symbol
• element name

A negatively charged particle that moves around the nucleus is a(n)

• proton
• neutron
• electron
• quark

Which particle has a positive charge?

• electron
• orbital
• proton
• neutron