History of the Atom

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 is the nucleus of an atom?

Back

The nucleus is the central region of an atom where neutrons and protons are located.

Front

Who created the plum pudding model of the atom?

Back

The plum pudding model was created by JJ Thomson.

Front

What are different elements?

Back

Different elements are atoms that have different numbers of protons.

Front

What is the mass number of an atom?

Back

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

Front

What is an electron cloud?

Back

The electron cloud is the area around the nucleus where electrons are likely to be found.

Front

Who proposed the atomic theory?

Back

John Dalton proposed the atomic theory, which states that all matter is made of atoms.

Front

What is an isotope?

Back

Isotopes are atoms of the same element that have different numbers of neutrons.

Front

What is a proton?

Back

A proton is a positively charged particle found in the nucleus of an atom.

Front

What is a neutron?

Back

A neutron is a neutral particle found in the nucleus of an atom.