MSC Grid 3AS Test

Front

Who proposed the theory that atoms orbit the nucleus in specific energy levels?

Back

Bohr

Front

Who was the first person to propose the concept of an atom?

Back

Democritus

Front

What do isotopes of carbon have in common?

Back

They have the same atomic number and different mass numbers.

Front

Subatomic particles with a negative charge are called ________.

Back

Electrons

Front

What is the correct chronological order of the Atomic Theory Timeline?

Back

Democritus, Dalton, Thomson, Rutherford, Bohr

Front

What is an atom?

Back

The smallest unit of matter that retains the properties of an element.

Front

What are protons?

Back

Subatomic particles with a positive charge found in the nucleus of an atom.

Front

What is the atomic number?

Back

The number of protons in the nucleus of an atom, which determines the element's identity.

Front

What are neutrons?

Back

Subatomic particles with no charge, found in the nucleus of an atom.

Front

What is the mass number?

Back

The total number of protons and neutrons in an atom's nucleus.