1.1. A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

What is the smallest part of an element that can exist?

An atom.

What does the chemical symbol 'Na' represent?

An atom of sodium.

How are compounds formed?

By chemical reactions between elements.

What is a mixture?

A combination of two or more elements or compounds not chemically combined together.

What are the methods to separate mixtures?

Filtration, crystallisation, simple distillation, fractional distillation, and chromatography.

What was the first model of the atom?

Atoms were thought to be tiny spheres that could not be divided.

What was the outcome of the alpha particle scattering experiment?

The mass of an atom is concentrated at the nucleus, which is positively charged.

What did Niels Bohr suggest about electrons?

Electrons orbit the nucleus at specific distances.

What is an atomic number?

The number of protons in an atom of an element.

What is the relative charge of a proton?

+1.

What do isotopes represent?

Atoms of the same element with different numbers of neutrons.

What information does electronic structure provide?

How many electrons are in each shell of an atom.