Atomic Theory & Structure

Front

What is the measure mainly of the nuclear particles in an atom?

Back

Atomic Mass is the measure of the total number of protons and neutrons in an atom's nucleus.

Front

Who stated that atoms cannot be divided?

Back

John Dalton stated that atoms cannot be divided.

Front

Who was the first person to propose the Atomos Theory?

Back

Democritus was the first to propose the Atomos Theory.

Front

What does the Atomic Number represent?

Back

The Atomic Number represents the number of protons in an element.

Front

Who is known for the 'Plum Pudding' model of the atom?

Back

J.J. Thomson is known for the 'Plum Pudding' model of the atom.

Front

What are subatomic particles?

Back

Subatomic particles are particles smaller than an atom, including protons, neutrons, and electrons.

Front

What is the difference between Atomic Mass and Mass Number?

Back

Atomic Mass is the weighted average mass of an element's isotopes, while Mass Number is the total number of protons and neutrons in a specific isotope.

Front

What is an isotope?

Back

An isotope is a variant of a chemical element that has the same number of protons but a different number of neutrons.

Front

What did Ernest Rutherford discover about the atom?

Back

Ernest Rutherford discovered that atoms have a small, dense nucleus surrounded by electrons.

Front

What is the role of electrons in an atom?

Back

Electrons are negatively charged particles that orbit the nucleus and are involved in chemical bonding.