GCSE Chemistry · key term

Diameter

Definition

The distance from one side of an object to the other through its centre.

Used by OCR

Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)

The nucleus lies at the centre of an atom. Its diameter is about one hundred-thousandth of the atom's diameter.
Revise: Size and scale of atoms

1
When comparing sizes, compare like with like: diameter with diameter or radius with radius.
2
A nucleus being one hundred-thousandth of an atom's diameter means it is $10^5$ times smaller, not $10^{-5}$ times smaller.

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GCSE Chemistry · key term

The distance from one side of an object to the other through its centre.

Used by OCR

Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)

The nucleus lies at the centre of an atom. Its diameter is about one hundred-thousandth of the atom's diameter.
Revise: Size and scale of atoms

1
When comparing sizes, compare like with like: diameter with diameter or radius with radius.
2
A nucleus being one hundred-thousandth of an atom's diameter means it is $10^5$ times smaller, not $10^{-5}$ times smaller.

Create a free account to read GCSE Chemistry revision notes for your exam board and track your progress.