Atomic Theory

Front

What is the correct sequence of the scientists who made major changes in the model of the atom?

Back

John Dalton, J.J. Thomson, Ernest Rutherford, Niels Bohr, Erwin Schrodinger.

Front

What does the word 'atom' mean in Greek?

Back

Indivisible.

Front

What did J.J. Thomson discover about the atom?

Back

The atom contains negatively charged particles (electrons).

Front

What did J.J. Thomson's experiments reveal about the atom's charge?

Back

The atom contains both negatively and positively charged particles.

Front

Who was the first person to propose a theory about the atom?

Back

Democritus.

Front

What is Dalton's Atomic Theory?

Back

1. All matter is made of atoms. 2. Atoms are indivisible and indestructible. 3. All atoms of a given element are identical in mass and properties. 4. Compounds are formed by a combination of two or more different kinds of atoms.

Front

What did Ernest Rutherford's gold foil experiment demonstrate?

Back

The existence of a small, dense nucleus at the center of the atom.

Front

What is the significance of Niels Bohr's model of the atom?

Back

It introduced the idea of quantized energy levels for electrons.

Front

What is the modern understanding of the atom's structure?

Back

Atoms consist of a nucleus made of protons and neutrons, surrounded by a cloud of electrons.

Front

What is the charge of a proton?

Back

Positive.