Chemistry · May / June 2023 · Paper 11 · Question 21

The elements are arranged in groups and periods in the Periodic Table. Which row is correct?

Agroup determined by: the number of electrons in the outer shell; period determined by: the number of occupied shells; elements in the Periodic Table are arranged by: increasing proton number
Bgroup determined by: the number of occupied shells; period determined by: the number of electrons in the outer shell; elements in the Periodic Table are arranged by: increasing mass number
Cgroup determined by: the number of electrons in the outer shell; period determined by: the number of occupied shells; elements in the Periodic Table are arranged by: increasing mass number
Dgroup determined by: the number of occupied shells; period determined by: the number of electrons in the outer shell; elements in the Periodic Table are arranged by: increasing proton number

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Correct answer: A. group determined by: the number of electrons in the outer shell; period determined by: the number of occupied shells; elements in the Periodic Table are arranged by: increasing proton number

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