Chemistry Chapter 4 Reveiw

Front

Who discovered the electron?

Back

J.J. Thompson is credited with the discovery of the electron in 1897.

Front

What did Dalton discover?

Back

John Dalton is known for proposing the atomic theory and discovering that atoms combine in fixed ratios.

Front

What does the law of definite proportions state?

Back

The law of definite proportions states that a chemical compound always contains its component elements in fixed ratio by mass.

Front

Who formulated the law of definite proportions?

Back

Joseph Proust formulated the law of definite proportions based on his experiments with chemical compounds.

Front

What type of particles did J.J. Thompson conclude were in every atom?

Back

J.J. Thompson concluded that every atom contains negatively charged particles, known as electrons.

Front

What is an atom?

Back

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

Front

What are protons?

Back

Protons are positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

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

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons.

Front

What is the charge of an electron?

Back

Electrons have a negative charge.