Atomic Structure

Front

A subatomic particle that has a negative charge is called a(n)

Back

electron

Front

How many electrons does an element have with a mass number of 36?

Back

36

Front

Which of the following particles has the least mass?

proton

,

electron

,

neutron

,

orbit

Back

electron

Front

What did Democritus think matter was made of?

Back

That it could not be divided.

Front

An atom’s mass number equals the number of:

• protons plus the number of electrons
• protons plus the number of protons
• protons plus the number of neutrons
• neutrons

Back

Protons plus the number of neutrons

Front

What is an atom’s nucleus made of?

Back

protons and neutrons

Front

Who provided evidence for the existence of an electron in an atom? Options:

Rutherford

,

Thomson

,

Dalton

,

Bohr

Back

Thomson

Front

Rutherford’s gold foil experiment provided evidence for which statement?

Back

There is a dense, positively charged mass in the center of an atom

Front

Which of the following statements is not true?

• Protons have a positive charge.
• A nucleus has a positive charge.
• Neutrons have no charge.
• Neutrons have a negative charge.

Back

Neutrons have a negative charge.

Front

Chlorine’s atomic number is 17. What does this indicate about an oxygen atom?

Back

17 protons in its nucleus