Question 1

Atoms

Accepted Answer

Atoms are very small. They have a radius of about 1 × 10-10m. Almost all of the mass of an atom is in the centre (nucleus). Contained in the nucleus are subatomic particles called protons and neutrons. Smaller particles called electrons are found orbiting the nucleus in shells or energy levels. Electrons are negatively charged. Overall, atoms have no charge; the number of protons is equal to the number of electrons.

Question 2

Elements

Accepted Answer

Elements are substances made of only one type of atom. Elements can be represented as  symbols: 
N = Nitrogen 
F = Fluorine 
Zn = Zinc 
Ca = Calcium 
Na = Sodium

Question 3

Isotopes

Accepted Answer

Isotopes are atoms of the same element with different numbers of neutrons. They have the same atomic number but a different relative atomic mass. The number of neutrons in an atom of an element can be calculated by taking the atomic number away from the relative atomic mass.

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Tag: atomic structure

AQA GCSE Combined Chemistry Paper 1: Atomic Structure Revision

Physics Paper 1 Revision: Energy, Electricity, Particle Model of Matter & Atomic Structure