Atomic Structure & History (3.1-3.4)

Front

What did Niels Bohr propose about electron movement in atoms?

Back

Niels Bohr proposed that electrons move around the nucleus in specific layers, or shells.

Front

How many electrons can fit in the first shell of an atom?

Back

The first shell can hold a maximum of 2 electrons.

Front

What is the significance of the term 'atomos' in atomic theory?

Back

The term 'atomos' was used by Democritus to describe the indivisible particle that makes up matter.

Front

What does Thomson's atomic model represent?

Back

Thomson's atomic model represents the 'plum pudding' model, where electrons are embedded in a positively charged 'soup'.

Front

How many protons are present in a titanium atom?

Back

A titanium atom has 22 protons.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the atomic number of an element?

Back

The atomic number of an element is the number of protons in its nucleus.

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 isotope?

Back

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