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because this lithium atom has 3 protons and 4 neutrons mass number is total of neutrons and protons grams 12C allow carbon-12 or C-12 ignore hydrogen or H max 2 if no numbers given numbers if given must be correct any three from: both have 8 protons 18O has 10 neutrons 16O has 8 neutrons both have 8 electrons - AQA - GCSE Chemistry - Question 2 - 2015 - Paper 2
Question 2
because this lithium atom has 3 protons and 4 neutrons mass number is total of neutrons and protons grams 12C allow carbon-12 or C-12 ignore hydrogen or H max 2 i... show full transcript
Worked Solution & Example Answer:because this lithium atom has 3 protons and 4 neutrons mass number is total of neutrons and protons grams 12C allow carbon-12 or C-12 ignore hydrogen or H max 2 if no numbers given numbers if given must be correct any three from: both have 8 protons 18O has 10 neutrons 16O has 8 neutrons both have 8 electrons - AQA - GCSE Chemistry - Question 2 - 2015 - Paper 2
Step 1
because this lithium atom has 3 protons and 4 neutrons
Answer
A lithium atom is identified by its atomic number, which is the number of protons. Therefore, a lithium atom has 3 protons. The number of neutrons in this atom is 4, leading to a mass number of 7, as mass number is calculated by the formula:
where A is the mass number, Z is the number of protons, and N is the number of neutrons.
Step 2
Step 3
max 2 if no numbers given numbers if given must be correct
Answer
To compare isotopes, we can analyze the isotopes of oxygen. The oxygen isotopes considered here are 18O and 16O. We need to ensure that any statements made regarding the number of protons and neutrons are accurate. For oxygen (O):
- Both isotopes have the same number of protons (8).
- The isotope 18O has 10 neutrons.
- The isotope 16O has 8 neutrons.
- Both isotopes also have 8 electrons, maintaining charge neutrality.