Atoms Vocabulary Flashcard

Front

What is the center of an atom where most of its mass and positive charge is concentrated?

Back

The nucleus.

Front

What is the name of the negatively charged particle that occupies the space in an atom outside the nucleus?

Back

Electron.

Front

What do you call two or more atoms that are held together by covalent bonds and act as a unit?

Back

Molecule.

Front

What is the smallest particle that is the building block of matter?

Back

Atom.

Front

What type of charged particle is a proton?

Back

Positively charged.

Front

What is the charge of an electron?

Back

Negatively charged.

Front

What is the term for the number of protons in the nucleus of an atom?

Back

Atomic number.

Front

What is the term for the sum of protons and neutrons in an atom's nucleus?

Back

Mass number.

Front

What is the term for atoms of the same element that have different numbers of neutrons?

Back

Isotopes.

Front

What is the force that holds protons and neutrons together in the nucleus?

Back

Nuclear force.