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Chemistry Unit 1 by Mind Map: Chemistry
Unit 1
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Chemistry Unit 1

Sub Atomic Sturcture


The number of protons in an element is determined by the atomic number. This is the top number by each element on the periodic table


Element's mass number determines number of protons and neutrons in an atom. This is the bottom number by each element on the periodic table.


The number of electrons in an atom is equal to the atomic number. However electrons are transferable so by bonding, atoms often lose or gain one.


Ionic bonding

Ionic bonding occurs when atoms lose or gain electrons from other atoms to make themselves stable. (full outer shell)

When an atom loses an electron it becomes positively charged, and when it gains an electron it becomes negatively charged.

For an atom to become charged, another must become oppositely charged. They then attract causing ionic bonding.

Covalent bonding

Covalent bonding always occurs between 2 non-metals

The atoms share either single or multiple electrons which causes a bond. As the electrons are shared there is no change in charge.

Metallic bonding

Metallic bonding can only occur between 2 or more metal atoms

All the electrons become free between the atoms making the atoms positively charged whereas the electrons are negatively charged.

The metals are then attracted to the electrons creating a bond between them.

Properties of compounds

Properties of Ionic compounds

Ionic structures are brittle because if 1 layer of particles are moved across the all repel each other.

When in liquid form, ionic compounds conduct electricity as the ions are free moving so can travel as electricity.

Properties of covalent compounds

Covalent compounds have low boiling and melting points as they are only weakly attracted as there is no charge.

Covalent compounds don't conduct electricity as they have no charge.

However some covalent bonds are very strong and hard to break down such as diamond. This is due to the amount of bonds each carbon atoms creates.

Properties of metallic compounds

Many different metals have different properties which can be harnessed through metallic bonding.


Good conductor of heat and electricity



Nanotechnology is the use of subatomic particles to obtain certain results.

The arrangement of different atoms gives different results. Research is being done into how we can use these micro structures

Chemical Formula

Relative formula mass

For relative formula mass to be calculated, you must first know the relative atomic mass of each different atom in the formula. This is also known as 1 mole of that particular atom.

These are then substituted into the formula to the formula mass can be calculated.

Percentage composition and Percentage Yield.

% composition is the % of a an element by mass in a compound

% composition = Relative atomic mass / Relative formula mass.

% yield is the actual amount of product compared to the expected amount.

% yield = actual yield / expected yield