SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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protons and neutrons in the nucleus of an atom
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protons and electrons in the nucleus of an atom
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neutrons and electrons in the nucleus of an atom
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None of the above
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Detailed explanation-1: -Together, the number of protons and the number of neutrons determine an element’s mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.
Detailed explanation-2: -The positively charged protons tend to repel each other, and the neutrons help to hold the nucleus together. The number of protons is the atomic number, and the number of protons plus neutrons is the atomic mass.
Detailed explanation-3: -The number of protons in a nucleus is called the atomic number and always equals the number of electrons in orbit about that nucleus (in a nonionized atom). Thus, all atoms that have the same number of protons–the atomic number–are atoms of the same element.
Detailed explanation-4: -The ‘atomic mass’ of the nucleus is given by A=Z+N, where N is the number of neutrons in the nucleus. Different isotopes of an element have different numbers of neutrons in their nucleus. For example: the stable isotope carbon-12, the most common type of carbon in the human body, has Z=6 and N=6.
Detailed explanation-5: -The atomic number is the number of protons in an element, while the mass number is the number of protons plus the number of neutrons.