EASY
AS and A Level
IMPORTANT
Earn 100
An oxygen atom has 8 protons in its nucleus. Explain why it cannot have 9 protons.
Important Questions on Atomic Structure
MEDIUM
AS and A Level
IMPORTANT
When deducing the relative mass of an atom, the electrons are not used in the calculation. Explain why not.
EASY
AS and A Level
IMPORTANT
The table below shows the two naturally occurring isotopes of chlorine. Complete the table:
| number of protons | ||
| number of electrons | ||
| number of neutrons |
MEDIUM
AS and A Level
IMPORTANT
The relative atomic mass of chlorine is 35.5. What does this tell you about the relative abundance of the two naturally occurring isotopes of chlorine?
MEDIUM
AS and A Level
IMPORTANT
Magnesium chloride contains magnesium ions, , and chloride ions, .
i) Explain why a magnesium ion is positively charged.
ii) Explain why a chloride ion has a single negative charge.
