National 5 Chemistry Periodic Table and Atomic Structure

Front

How are elements in the Periodic Table arranged ?

Back

Elements are arranged in order of increasing atomic number.

Front

Definition of groups in the Periodic Table

Back

Groups are columns containing elements with the same number of outer electrons, indicated by the group number.

Front

Chemical properties of elements within a group

Back

Elements within a group share the same valency and have similar chemical properties because they have the same number of electrons in their outer energy levels.

Front

Structure of an atom

Back

An atom has a nucleus containing protons and neutrons, and electrons that orbit the nucleus.

Front

Charge of protons, neutrons, and electrons

Back

Protons have a charge of one-positive, neutrons are neutral, and electrons have a charge of one-negative.

Front

Mass of protons, neutrons, and electrons

Back

Protons and neutrons have an approximate mass of one atomic mass unit, while electrons have virtually no mass.

Front

Atomic number of an atom

Back

The number of protons in an atom is given by the atomic number.

Front

Number of electrons in a neutral atom

Back

In a neutral atom, the number of electrons is equal to the number of protons.

Front

Mass number of an atom

Back

The mass number is equal to the number of protons added to the number of neutrons.

Front

Definition of isotopes

Back

Isotopes are atoms with the same atomic number but different mass numbers, or the same number of protons but different numbers of neutrons.