Chemistry C1 1.2 Atomic structure.

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What is the nucleus of an atom made of?
Protons and neutrons.
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What charges do protons, electrons and neutrons have?
Protons have a positive charge, electrons have a negative charge and neutrons are not charged (neutral).
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What is the atomic number of an element equal to?
The atomic number of an element is also know as the proton number and is equal to the number of protons in the nucleus of its atoms.
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In what order are elements arranged in the periodic table?
In order of their atomic numbers.
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What is the mass number of an atom?
The mass number is the sum of the protons and neutrons in the nucleus of an atom.
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What is the nucleus of an atom?
The centre of an atom containing two types of particle (protons and neutrons).
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What are electrons?
Negatively charged particles that move around the nucleus.
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What charge does an atom have?
An atom has no overall charge (neutral) because the number of protons is equal to the number of electrons and their charges are equal and opposite (proton +1 and electron -1).
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How many protons, neutrons and electrons are there in an atom of aluminium (atomic number 13, mass number 27)?
13 protons, 13 electrons and 14 neutrons.
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Card 2

Front

What charges do protons, electrons and neutrons have?

Back

Protons have a positive charge, electrons have a negative charge and neutrons are not charged (neutral).

Card 3

Front

What is the atomic number of an element equal to?

Back

Preview of the front of card 3

Card 4

Front

In what order are elements arranged in the periodic table?

Back

Preview of the front of card 4

Card 5

Front

What is the mass number of an atom?

Back

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