Chemistry 2 GCSE AQA

• The atomic (proton) number tells you how many protons there are (the bottom small number)
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•  The mass number is always the bigger number.

• Atoms of the same element have the same number of protoms- so atoms of different elements have different number of protons.

• To find out the number of neutrons subtract the atomic number (number of protons) from the mass number ( the total number of protons and nuetrons.)

• There roughly the same number of protons and nuetrons in an atom. As the mass number is roughly double the proton number.

Compound are chemicaly bonded,( usually using heat) and it is difficalt to sepirate them when bonded.Elements constist of one type of atom only.

ISOTOPES ARE DIFFERENT ATOMIC FORMES OF THE SAME ELEMENT , WHICH HAVE THE SAME NUMBER OF PROTONS AND A DIFFERENT NUMBER OF NEUTRONS. 

  If they have a different number of protons they are a different element altogether