AQA GCSE Chemistry Topic 1: Atomic Structure and the Periodic Table

Flashcards based on the AQA GCSE Chemistry lecture notes covering atomic structure, compounds, mixtures, the history of atomic models, and electronic structure.

Atoms are the smallest part of an element that can exist and they make up all __.

substances

A mixture consists of two or more __ or compounds that are not chemically combined together.

elements

Chemical symbols represent an atom of an __, for example, Na represents sodium.

element

Compounds can be represented by formulae using the symbols of the __ from which they were formed.

atoms

The plum pudding model suggested that an atom is a ball of positive charge with __ embedded in it.

negative electrons

The nucleus of an atom was concluded to contain concentrated mass and was __ charged, as discovered through alpha particle scattering.

positively

The mass number is the sum of the and in an atom.

protons; neutrons

Isotopes are atoms of the same element with __ numbers of neutrons.

different

The relative atomic mass is an average value that takes account of the __ of the isotopes of the element.

abundance

In sodium, the electronic structure can be represented as __.

2,8,1