A-Level CIE Chemistry 1.1 Atomic Structure: In which pair do the atoms conta

In which pair do the atoms contain the same number of neutrons? A $^{11}B$ and $^{12}C$ B $^{7}Li$ and $^{9}Be$ C $^{24}Mg$ and $^{28}Si$ D $^{14}N$ and $^{16}O$ - CIE - A-Level Chemistry - Question 1 - 2017 - Paper 1

Question 1

$In-which-pair-do-the-atoms-contain-the-same-number-of-neutrons?--A--$^{11}B$-and-$^{12}C$-B--$^{7}Li$-and-$^{9}Be$-C--$^{24}Mg$-and-$^{28}Si$-D--$^{14}N$-and-$^{16}O$-CIE-A-Level Chemistry-Question 1-2017-Paper 1.png$

In which pair do the atoms contain the same number of neutrons? A $^{11}B$ and $^{12}C$ B $^{7}Li$ and $^{9}Be$ C $^{24}Mg$ and $^{28}Si$ D \(^{14}N... show full transcript

Worked Solution & Example Answer:In which pair do the atoms contain the same number of neutrons? A $^{11}B$ and $^{12}C$ B $^{7}Li$ and $^{9}Be$ C $^{24}Mg$ and $^{28}Si$ D $^{14}N$ and $^{16}O$ - CIE - A-Level Chemistry - Question 1 - 2017 - Paper 1

Step 1

Evaluate pair A: $^{11}B$ and $^{12}C$

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Answer

The number of neutrons in (^{11}B) is (11 - 5 = 6) and in (^{12}C) is (12 - 6 = 6). This pair contains the same number of neutrons.

Step 2

Evaluate pair B: $^{7}Li$ and $^{9}Be$

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Answer

The number of neutrons in (^{7}Li) is (7 - 3 = 4) and in (^{9}Be) is (9 - 4 = 5). This pair does not contain the same number of neutrons.

Step 3

Evaluate pair C: $^{24}Mg$ and $^{28}Si$

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Answer

The number of neutrons in (^{24}Mg) is (24 - 12 = 12) and in (^{28}Si) is (28 - 14 = 14). This pair does not contain the same number of neutrons.

Step 4

Evaluate pair D: $^{14}N$ and $^{16}O$

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Answer

The number of neutrons in (^{14}N) is (14 - 7 = 7) and in (^{16}O) is (16 - 8 = 8). This pair does not contain the same number of neutrons.

Step 5

Conclusion

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Answer

The correct pair where the atoms have the same number of neutrons is pair A: (^{11}B) and (^{12}C).

In which pair do the atoms contain the same number of neutrons? A \(^{11}B\) and \(^{12}C\) B \(^{7}Li\) and \(^{9}Be\) C \(^{24}Mg\) and \(^{28}Si\) D \(^{14}N\) and \(^{16}O\) - CIE - A-Level Chemistry - Question 1 - 2017 - Paper 1

Worked Solution & Example Answer:In which pair do the atoms contain the same number of neutrons? A \(^{11}B\) and \(^{12}C\) B \(^{7}Li\) and \(^{9}Be\) C \(^{24}Mg\) and \(^{28}Si\) D \(^{14}N\) and \(^{16}O\) - CIE - A-Level Chemistry - Question 1 - 2017 - Paper 1

Evaluate pair A: \(^{11}B\) and \(^{12}C\)

Evaluate pair B: \(^{7}Li\) and \(^{9}Be\)

Evaluate pair C: \(^{24}Mg\) and \(^{28}Si\)

Evaluate pair D: \(^{14}N\) and \(^{16}O\)

Conclusion

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