Chemistry

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How many atoms is an element made up of?
One type of atom
1 of 18
What do compounds contain?
More than one type of atom
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How are the elements arranged into groups in the periodic table?
They usually have the same properties
3 of 18
What does the nucleus contain at the centre of an atom?
Two types of particle, protons and neutrons
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What charges do protons and neutrons have?
Protons have a positive charge and neutrons have no charge
5 of 18
What charge does an electron have?
A negative charge
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What is the atomic number of an element equal to?
The number of protons in the nucleus of its atoms
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What is the mass number?
The number of protons + the number of neutrons
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What are shells?
Electrons in atoms are in energy levels that are represented by shells
9 of 18
Where are the electrons in the lowest energy level?
In the shell closest to the nucleus
10 of 18
What do different elements form when combined?
Compounds
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What is formed when a metal reacts with a non metal?
Ions are formed
12 of 18
What does the formula of a molecule show?
The number of atoms in the molecule
13 of 18
What does the formula of an ionic compound show?
The simplest ratio of ions
14 of 18
What happens to atoms in chemical reactions?
They get re-arranged
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What is the mass of products equal to?
The mass of reactants
16 of 18
What should symbol equations always be?
Balanced
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When are atoms neither created of destroyed?
In a chemical reaction
18 of 18

Other cards in this set

Card 2

Front

What do compounds contain?

Back

More than one type of atom

Card 3

Front

How are the elements arranged into groups in the periodic table?

Back

Preview of the front of card 3

Card 4

Front

What does the nucleus contain at the centre of an atom?

Back

Preview of the front of card 4

Card 5

Front

What charges do protons and neutrons have?

Back

Preview of the front of card 5
View more cards

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