The diagram shows an atom of lithium - Edexcel - GCSE Chemistry - Question 2 - 2013 - Paper 1
Question 2
The diagram shows an atom of lithium.
(i) A proton has been labelled.
Complete the diagram by labelling the other two particles shown. (2)
(ii) Complete the senten... show full transcript
Worked Solution & Example Answer:The diagram shows an atom of lithium - Edexcel - GCSE Chemistry - Question 2 - 2013 - Paper 1
Step 1
Complete the diagram by labelling the other two particles shown.
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Answer
The two particles to label in the diagram are:
Neutron: This particle is neutral and exists in the nucleus alongside the proton.
Electron: This negatively charged particle orbits the nucleus.
Step 2
Complete the sentence by putting a cross (✔) in the box next to your answer.
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Answer
The atomic number of lithium is A 3.
The atomic number is defined as the number of protons in an atom, and lithium has 3 protons.
Step 3
Which row of the table shows the charge on a proton and the charge on an electron?
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Answer
The correct row is D, where the proton has a positive charge and the electron has a negative charge.
