A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes key terms

neutron

A subatomic particle found in the nucleus of an atom, with no electrical charge.

relative electrical charge

The measure of the electric charge of a particle compared to the charge of a proton.

electron

A subatomic particle with a relative electrical charge of -1. In Relative electrical charges of subatomic particles, this term helps explain state the relative electrical charge of an electron for AQA GCSE Chemistry 8462.

relative electrical charge

The measure of the electric charge of a subatomic particle compared to a proton.

proton

A positively charged subatomic particle found in the nucleus of an atom. In Relative electrical charges of subatomic particles, this term helps explain explain why atoms have no overall electrical charge when the number of electrons equals the number of protons for AQA GCSE Chemistry 8462.

electron

A negatively charged subatomic particle that orbits the nucleus of an atom. In Relative electrical charges of subatomic particles, this term helps explain explain why atoms have no overall electrical charge when the number of electrons equals the number of protons for AQA GCSE Chemistry 8462.

atomic number

The number of protons in an atom of an element. In Relative electrical charges of subatomic particles, this term helps explain define atomic number as the number of protons in an atom of an element for AQA GCSE Chemistry 8462.

proton

A positively charged subatomic particle found in the nucleus of an atom. In Relative electrical charges of subatomic particles, this term helps explain define atomic number as the number of protons in an atom of an element for AQA GCSE Chemistry 8462.

proton

A positively charged subatomic particle found in the nucleus of an atom. In Relative electrical charges of subatomic particles, this term helps explain explain why atoms of the same element have the same number of protons for AQA GCSE Chemistry 8462.

element

A substance that consists of only one type of atom, characterized by its number of protons.

proton

A positively charged subatomic particle found in the nucleus of an atom. In Relative electrical charges of subatomic particles, this term helps explain explain why atoms of different elements have different numbers of protons for AQA GCSE Chemistry 8462.

atomic number

The number of protons in an atom of an element, which determines the element's identity.

nucleus

The central part of an atom, containing protons and neutrons. In Relative electrical charges of subatomic particles, this term helps explain use the nuclear model to describe atoms in terms of nucleus and electrons for AQA GCSE Chemistry 8462.

electron

A negatively charged subatomic particle that orbits the nucleus of an atom. In Relative electrical charges of subatomic particles, this term helps explain use the nuclear model to describe atoms in terms of nucleus and electrons for AQA GCSE Chemistry 8462.

atomic radius

the distance from the nucleus to the outermost electron shell, approximately 0.1 nm.

nucleus

the central part of an atom, containing protons and neutrons, and much smaller than the atom itself.

atomic radius

The distance from the nucleus to the outermost electron shell of an atom, typically measured in nanometers.

standard form

A way of expressing numbers that are too large or too small to be conveniently written in decimal form, using powers of ten.

nucleus

The central part of an atom, containing protons and neutrons, and is much smaller than the atom itself.

atomic radius

The size of an atom, typically measured as about 0.1 nm. In Size and mass of atoms, this term helps explain state that a nucleus is much smaller than an atom, with a radius of about 1 x 10^-14 m for AQA GCSE Chemistry 8462.

nucleus

The central part of an atom where almost all its mass is concentrated. In Size and mass of atoms, this term helps explain explain that almost all the mass of an atom is concentrated in the nucleus for AQA GCSE Chemistry 8462.

mass

The amount of matter in an atom, primarily found in the nucleus. In Size and mass of atoms, this term helps explain explain that almost all the mass of an atom is concentrated in the nucleus for AQA GCSE Chemistry 8462.

Proton

A subatomic particle with a positive charge found in the nucleus of an atom. In Size and mass of atoms, this term helps explain state the relative masses of protons, neutrons and electrons for AQA GCSE Chemistry 8462.

Neutron

A subatomic particle with no charge, also located in the nucleus of an atom. In Size and mass of atoms, this term helps explain state the relative masses of protons, neutrons and electrons for AQA GCSE Chemistry 8462.

mass number

The total number of protons and neutrons in an atom. In Size and mass of atoms, this term helps explain define mass number as the total number of protons and neutrons in an atom for AQA GCSE Chemistry 8462.

protons

Positively charged subatomic particles found in the nucleus of an atom. In Size and mass of atoms, this term helps explain define mass number as the total number of protons and neutrons in an atom for AQA GCSE Chemistry 8462.

isotope

Atoms of the same element with different numbers of neutrons. In Size and mass of atoms, this term helps explain define isotopes as atoms of the same element with different numbers of neutrons for AQA GCSE Chemistry 8462.

mass number

The total number of protons and neutrons in an atom. In Size and mass of atoms, this term helps explain define isotopes as atoms of the same element with different numbers of neutrons for AQA GCSE Chemistry 8462.

isotope notation

A way of representing isotopes that shows the atomic number and mass number of an atom.

atomic number

The number of protons in the nucleus of an atom, which determines the element's identity.