KS3 Science Quiz - Atoms and Elements 02 (Questions)

This KS3 Science quiz will quiz you on atoms and elements. In 1661, Robert Boyle defined an element as a substance that could not be broken down into a simpler substance. At the start of the 20th century, scientists discovered that elements were made up from atoms which could be split into protons, neutrons and electrons. Now, we say that an element is a substance that contains only one type of atom. Each of the different atoms has a name and a chemical symbol. A chemical symbol always starts with a capital letter and is followed by either zero, one or two small letters e.g. I and Ir stand for iodine and iridium.

Chemical formulae are a quick way of writing down information about chemical substances - Cu is the shorthand for 'here we have one single atom of the element copper'.

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The formula for water is H2O. Water is therefore not an element as it contains two different atoms - two atoms of hydrogen and one of oxygen. If there is no little number after a chemical symbol, it means there is only ONE atom. So in the formula H2SO4, there are 2 atoms of hydrogen (there is a small number 2 AFTER the symbol), only one atom of sulfur (there is NO small number after the symbol for sulfur) and 4 atoms of oxygen (can you see why?).

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1. The smallest part of an element that retains the identity (and the chemical properties) of that element is ...
[ ] A chemical
[ ] A molecule
[ ] An atom
[ ] An electron
2. An element has.....
[ ] Four names
[ ] One name
[ ] Three names
[ ] Two names
3. How many atoms of sulfur are there in CuSO4?
[ ] Four
[ ] One
[ ] Three
[ ] Two
4. What is the correct formula for H-H?
[ ] 2H
[ ] H1H1
[ ] H2
[ ] H22
5. What is the correct symbol for Iron?
[ ] Fe
[ ] FE
[ ] fe
[ ] Ir
6. Most of the elements in the periodic table are.....
[ ] Gases
[ ] Liquids
[ ] Metals
[ ] Non metals
7. Which of the following metals is a liquid at room temperature?
[ ] Lithium
[ ] Magnesium
[ ] Mercury
[ ] Sodium
8. Which elements are in SO2?
[ ] Sodium and oxygen
[ ] Strontium and oxygen
[ ] Sulfur and oxygen
[ ] Tin and oxygen
9. Which elements are in CoCO3?
[ ] Cobalt, carbon, oxygen
[ ] Cobalt, copper
[ ] Carbon, oxygen
[ ] Copper, chlorine, oxygen
10. Which are the three magnetic elements?
[ ] Cobalt, nickel, iron
[ ] Copper, nickel, iron
[ ] Iron, aluminium, copper
[ ] Iron, zinc, copper
KS3 Science Quiz - Atoms and Elements 02 (Answers)
1. The smallest part of an element that retains the identity (and the chemical properties) of that element is ...
[ ] A chemical
[ ] A molecule
[x] An atom
[ ] An electron
The idea of atoms has been around for thousands of years but it was only during the last two hundred years that scientists have found evidence they exist. In 1981, a very powerful microscope was developed that can be used to 'see' actual atoms
2. An element has.....
[ ] Four names
[x] One name
[ ] Three names
[ ] Two names
The name of many elements ends in -ium
3. How many atoms of sulfur are there in CuSO4?
[ ] Four
[x] One
[ ] Three
[ ] Two
There is no small number after the chemical symbol for sulfur therefore there is only one atom
4. What is the correct formula for H-H?
[ ] 2H
[ ] H1H1
[x] H2
[ ] H22
This is a simple representation of a molecule of the element hydrogen. You know that it is an element because there is only one type of atom in the formula
5. What is the correct symbol for Iron?
[x] Fe
[ ] FE
[ ] fe
[ ] Ir
A symbol MUST have ONE capital letter - no more, no less. That means the correct answer cannot be either options 2 or 3. Option 4 is tempting, but is the symbol for the metal iridium. But why use Fe for the symbol? The Latin word for iron is ferrum and quite a few symbols come from the Latin names for the elements. Iron is very common, so, if you didn't already know it, it should not be too long before you have to remember that Fe is the chemical symbol for iron
6. Most of the elements in the periodic table are.....
[ ] Gases
[ ] Liquids
[x] Metals
[ ] Non metals
About three-quarters of all elements are metals
7. Which of the following metals is a liquid at room temperature?
[ ] Lithium
[ ] Magnesium
[x] Mercury
[ ] Sodium
It is a toxic (poisonous) metal
8. Which elements are in SO2?
[ ] Sodium and oxygen
[ ] Strontium and oxygen
[x] Sulfur and oxygen
[ ] Tin and oxygen
If you did not know the answer, you could easily have looked up the chemical symbols to find out what elements they represent
9. Which elements are in CoCO3?
[x] Cobalt, carbon, oxygen
[ ] Cobalt, copper
[ ] Carbon, oxygen
[ ] Copper, chlorine, oxygen
Counting the capital letters in the formula immediately tells you that answers 2 and 3 must be incorrect (there are 3 capitals so there must be three elements). It is then simply a case of looking up the symbols on the periodic table or in a list of elements
10. Which are the three magnetic elements?
[x] Cobalt, nickel, iron
[ ] Copper, nickel, iron
[ ] Iron, aluminium, copper
[ ] Iron, zinc, copper
Copper, aluminium and zinc are not attracted by magnets