Multiple Choice
Which of the following statements about the nucleus of a carbon-12 atom is true?
2. Atoms & Elements
Subatomic Particles
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What determines the number of protons in the nucleus of an atom?
A
The atomic number
B
The neutron number
C
The mass number
D
The electron number
Verified step by step guidance1
Understand that the atomic number is a fundamental property of an element that defines the number of protons in the nucleus of an atom. It is unique to each element and is represented by the symbol Z.
Recognize that the neutron number, which is the number of neutrons in the nucleus, does not determine the number of protons. Neutrons contribute to the mass of the atom but do not affect the atomic number.
Acknowledge that the mass number is the sum of protons and neutrons in the nucleus. While it includes the number of protons, it is not used to define the number of protons specifically.
Note that the electron number in a neutral atom is equal to the number of protons, but it does not determine the number of protons. Electrons can be gained or lost in chemical reactions, affecting the charge but not the atomic number.
Conclude that the atomic number is the correct determinant of the number of protons in the nucleus of an atom, as it is a defining characteristic of each element on the periodic table.
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