Approximately 98.89% of carbon on the surface of the earth and in the atmosphere is carbon-12; the remaining approximately 1.11% is carbon-13. The numbers 12 and 13 are mass numbers. The atomic number of carbon is 6. (i) How many neutrons are in the nucleus of a carbon-13 atom? How? (ii) Enter the missing word in the following sentence. Carbon-12 and carbon-13 are _________________________ of carbon.

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Approximately 98.89% of carbon on the surface of the earth and in the atmosphere is carbon-12; the remaining approximately 1.11% is carbon-13 - Junior Cycle Science - Question e - 2009

Question e

Approximately-98.89%-of-carbon-on-the-surface-of-the-earth-and-in-the-atmosphere-is-carbon-12;-the-remaining-approximately-1.11%-is-carbon-13-Junior Cycle Science-Question e-2009.png

Approximately 98.89% of carbon on the surface of the earth and in the atmosphere is carbon-12; the remaining approximately 1.11% is carbon-13. The numbers 12 and 13 ... show full transcript

Worked Solution & Example Answer:Approximately 98.89% of carbon on the surface of the earth and in the atmosphere is carbon-12; the remaining approximately 1.11% is carbon-13 - Junior Cycle Science - Question e - 2009

Step 1

How many neutrons are in the nucleus of a carbon-13 atom?

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Answer

In a carbon-13 atom, the mass number is 13, and the atomic number, which represents the number of protons, is 6. To find the number of neutrons, you can use the formula:

$ext{Number of Neutrons} = ext{Mass Number} - ext{Atomic Number}$

Substituting the values:

$ext{Number of Neutrons} = 13 - 6 = 7$

Thus, there are seven neutrons in the nucleus of a carbon-13 atom.

Step 2

Enter the missing word in the following sentence.

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Answer

Carbon-12 and carbon-13 are isotopes of carbon.

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