# Abilty Test- The Structure of the Atom (Selective)

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• Created by: Heather
• Created on: 16-07-14 20:23
What is the relative mass of a proton, neutron and electron?
Proton- +1, Neutron- +1, Electron- Niglegible/ 1/1840
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What is the atomic number of an element?
The number of protons in its nucleus,
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What is the symbol for the atomic number?
Z
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What is the mass number of an element?
It represents the number of protons and neutrons in its nucleus,
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What is the symbol for the mass number?
A
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What is shown when you subtract Z from A?
The number of neutrons in the element's nucleus,
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What is an isotope?
An element with a different number of neutrons but the same number of protons
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Is the mass number or the atomic number different in isotopes of the same element?
The mass number of the isotopes are different but the atomic number of the isotopes are the same as the proton numbers have not changed,
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What is the average mass number of an element called?
Its Relative Atomic Mass,
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How many particles does 1 mole of a substance contain?
6.02 x 10 to the power of 23,
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6.02 x 10 to the power of 23 mol-1 is known as whose number?
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What is the equation with units to work out the number of moles?
Mass of the substance (g) / molar mass (g/mol)
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How many moles of sodium oxide are present in 24.8g of Na2O? Na=23 O=16
23 x 2=46, 16 x 1=16 46 +16= 62g/mol so 24.8/ 62 =0.4moles
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How many electrons can the first energy level hold and what is it called?
2 electrons and is called an 's' level,
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How many electrons can the second energy level hold and what is it called?
It can hold up to eight and is called the 'p' level,
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## Other cards in this set

### Card 2

#### Front

What is the atomic number of an element?

#### Back

The number of protons in its nucleus,

### Card 3

#### Front

What is the symbol for the atomic number?

### Card 4

#### Front

What is the mass number of an element?

### Card 5

#### Front

What is the symbol for the mass number?