# Elements

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• Created by: joshd
• Created on: 29-03-14 16:13
What do elements consist of?
One type of atom only.
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Name some of the everyday substances which are elements.
Copper, Aluminium, Iron, Oxygen, Nitrogen.
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What decides what element it is? Give an example.
The number of protons in an atom decides what element it is. For example, any atom of the element helium will have 2 protons - and any atom with 2 protons will be a helium atom.
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What does the atomic number say?
The atomic number says how many protons there are in an atom.
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Why is the atomic number unique to an element?
As no two elements have the same number of protons (e.g, only oxygen has the atomic number 8)
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What does the atomic number also tell us?
How many electrons there are, because an atom has the same number of electrons as protons.
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What is the mass number?
The total number of protons and neutrons in the atom. So if you want to find the number of neutrons in an atom, just subtract the atomic number from the mass number (e.g, there are 8 neutrons in an oxygen nucleus because 16-8 = 8)
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What is the mass number usually double of?
Of the atomic number, because there's about the same number of neutrons as protons in any nucleus.
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Where is the mass number situated of an element (e.g, on periodic table)?
Mass number = on top. Tells the total number of protons and neutrons in the atom. Atomic number = on bottom. This tells you the number of protons in the atom. (and so the number of electrons too)
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## Other cards in this set

### Card 2

#### Front

Name some of the everyday substances which are elements.

#### Back

Copper, Aluminium, Iron, Oxygen, Nitrogen.

### Card 3

#### Front

What decides what element it is? Give an example.

### Card 4

#### Front

What does the atomic number say?

### Card 5

#### Front

Why is the atomic number unique to an element?