An atom has a mass number of 9 and 5 neutrons. What is its atomic number?A.11B.14C.4D.19SUBMITarrow_backPREVIOUS
Question
An atom has a mass number of 9 and 5 neutrons. What is its atomic number?A.11B.14C.4D.19SUBMITarrow_backPREVIOUS
Solution
The atomic number of an atom is determined by the number of protons it has. The mass number of an atom is the sum of its protons and neutrons.
Given that the atom has a mass number of 9 and 5 neutrons, you can find the number of protons (and thus the atomic number) by subtracting the number of neutrons from the mass number.
So, 9 (mass number) - 5 (neutrons) = 4 (protons).
Therefore, the atomic number of the atom is 4. So, the correct answer is C.4.
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