Unit 2 - Intro to Atoms Vocab 24-25

Front

Matter

Back

Anything that has mass and takes up space

Front

Element

Back

A substance that cannot be broken down into simpler substances

Front

Atoms

Back

The smallest part of an element that still has all the properties of the element, also known as the building blocks of matter

Front

Molecule

Back

A substance made up of two or more atoms held together by a chemical bond

Front

Compound

Back

A substance made up of atoms of two or more different elements joined by chemical bonds

Front

Mixture

Back

A combination of two or more substances that are not chemically combined

Front

What did John Dalton discover about the atom?

Back

Elements are made of atoms that cannot be broken down

Front

What did JJ Thomson discover about the atom?

Back

His model shows negative charges scattered through a ball of positive charges.

Front

What did Ernest Rutherford discover about the atom?

Back

He identified the nucleus of an atom through his gold foil experiments.

Front

What did Niels Bohr discover about the atom?

Back

His model shows electrons travel in specific paths that orbit around the nucleus