Chemistry

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How many atoms is an element made up of?
One type of atom
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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
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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
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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
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Where are the electrons in the lowest energy level?
In the shell closest to the nucleus
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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
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What does the formula of a molecule show?
The number of atoms in the molecule
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What does the formula of an ionic compound show?
The simplest ratio of ions
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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
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What should symbol equations always be?
Balanced
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When are atoms neither created of destroyed?
In a chemical reaction
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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
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