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Unit 1 - Topic 4 - Writing Chemical Formulae

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

#1
Front (Question)

What are all substances made up of?

Back (Answer)

Atoms

#2
Front (Question)

What is an element?

Back (Answer)

A substance made from one kind of atom only.

#3
Front (Question)

What are unreactive elements called?

Back (Answer)

Monoatomic elements

#4
Front (Question)

Describe monoatomic elements

Back (Answer)

Monatomic means that an element is made from single atoms that are not joined together. Group 0 are the monatomic elements. The formulae of the monatomic elements are just their symbol.

#5
Front (Question)

How many diatomic molecules are there?

Back (Answer)

7

#6
Front (Question)

Name all the diatomic molecules

Back (Answer)

Hydrogen Fluorine Chlorine Bromine Iodine Oxygen Nitrogen

#7
Front (Question)

What are all group 7 elements?

Back (Answer)

Diatomic Molecules

#8
Front (Question)

Why is Astatine not considered a diatomic element?

Back (Answer)

Because it is a man-made element.

#9
Front (Question)

What are diatomic molecules?

Back (Answer)

Diatomic means a molecule made from two atoms. If both atoms in the molecule are the same, the molecule is an element.

#10
Front (Question)

What is a molecule?

Back (Answer)

A molecule is a group of two or more atoms, which are joined together. The smallest molecule is made from two atoms, a diatomic molecule.

#11
Front (Question)

How many type of molecules are there?

Back (Answer)

2

#12
Front (Question)

What are the different types of molecules?

Back (Answer)

Element Molecule – All the atoms in the molecule are the same type. Compound Molecule – Different atoms are joined together.

#13
Front (Question)

What are bonds?

Back (Answer)

Attractive forces which hold atoms together in a molecule.

#14
Front (Question)

How are mixtures formed?

Back (Answer)

When different elements are put together, but they do not react and join.

#15
Front (Question)

How are compounds formed?

Back (Answer)

When different elements (atoms) react and join together

#16
Front (Question)

What is a compound?

Back (Answer)

A compound is a substance made from different atoms joined together.

#17
Front (Question)

How many elements do compounds ending in -ide have in them?

Back (Answer)

2

#18
Front (Question)

How many elements do compounds ending in -ite or -ate have in them?

Back (Answer)

3, one of which is always Oxygen

#19
Front (Question)

What is the combining power of an atom called?

Back (Answer)

Valency

#20
Front (Question)

What is the valency of an atom?

Back (Answer)

The number of bonds an atom can make.

#21
Front (Question)

What valency do group 1 elements have?

Back (Answer)

1

#22
Front (Question)

What valency do group 2 elements have?

Back (Answer)

2

#23
Front (Question)

What valency do group 3 elements have?

Back (Answer)

3

#24
Front (Question)

What valency do group 4 elements have?

Back (Answer)

4