GCSE EDUQAS COMBINED SCIENCE CHEMISTRY: ATOMS
Compound
A substance made up of atoms of two or more different elements joined by chemical bonds. For
example, water.
Element
A pure substance made of only one kind of atom For example, a diamond is made of pure
carbon!
Plum Pudding Model (Thomson)
JJ Thomson's atomic model which depicts a positively charged space containing negatively
charged electrons
Electrons
Negatively charged particles
Proton
A particle that has a positive charge and is found in the nucleus of an atom
Sodium
Atomic Number: 11
Symbol: Na
Aluminium
Atomic Number: 13
Symbol: Al
How many neutrons does an aluminium atom have?
14
How many electrons does an aluminium atom have?
13
What is the mass number of lithium?
7
How many electrons does a lithium atom contain?
3
How many protons are there in an atom of potassium?
Compound
A substance made up of atoms of two or more different elements joined by chemical bonds. For
example, water.
Element
A pure substance made of only one kind of atom For example, a diamond is made of pure
carbon!
Plum Pudding Model (Thomson)
JJ Thomson's atomic model which depicts a positively charged space containing negatively
charged electrons
Electrons
Negatively charged particles
Proton
A particle that has a positive charge and is found in the nucleus of an atom
Sodium
Atomic Number: 11
Symbol: Na
Aluminium
Atomic Number: 13
Symbol: Al
How many neutrons does an aluminium atom have?
14
How many electrons does an aluminium atom have?
13
What is the mass number of lithium?
7
How many electrons does a lithium atom contain?
3
How many protons are there in an atom of potassium?
