Measurement and The Atom Flashcard Review

Front

What is the atomic number of an element?

Back

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

Front

What does the +3 in Al⁺³ indicate?

Back

The +3 indicates the charge of the atom, meaning it has lost three electrons.

Front

Who discovered the electron?

Back

J.J. Thomson discovered the electron in 1897.

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.

Front

What is an atom?

Back

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

Front

What are neutrons?

Back

Neutrons are neutral particles found in the nucleus of an atom, contributing to its mass.

Front

What is the mass number of an atom?

Back

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

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

What is the charge of an electron?

Back

An electron has a negative charge.