PS 5.1 atomic history

Front

Who was the first contributor to the atomic theory?

Back

Democritus

Front

Who discovered neutrons in the nucleus of atoms?

Back

James Chadwick

Front

What is the correct order of scientists in relation to atomic theory from earliest to most recent?

Back

Democritus, John Dalton, JJ Thomson, Ernest Rutherford, and Neils Bohr

Front

Who proposed that electrons move around the nucleus in shells?

Back

Niels Bohr

Front

Who developed the model of the atom that includes a nucleus?

Back

Ernest Rutherford

Front

What did John Dalton contribute to atomic theory?

Back

He proposed that all matter is made of atoms, which are indivisible and indestructible.

Front

What is the significance of J.J. Thomson's discovery?

Back

He discovered the electron, showing that atoms are not indivisible.

Front

What did Niels Bohr's model of the atom explain?

Back

It explained how electrons are arranged in orbits around the nucleus.

Front

What is the nucleus of an atom?

Back

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

Front

What are protons?

Back

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