Chapter 3 - Atoms, Elements, and the Periodic Table

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

Why is it misleading to say the atom is the smallest piece of matter?

Back

There are other particles inside of the atom.

Front

What are the main particles found in an atom?

Back

Protons, neutrons, and electrons.

Front

What charge do protons have?

Back

Protons have a positive charge.

Front

What charge do electrons have?

Back

Electrons have a negative charge.

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom that contains protons and neutrons.

Front

Who proposed the 'plum pudding' model of the atom?

Back

JJ Thomson proposed the 'plum pudding' model.

Front

Who organized the Periodic Table of Elements?

Back

Dmitri Mendeleev organized the Periodic Table of Elements.

Front

How many elements occur naturally in nature?

Back

Less than 100 elements occur naturally.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.