SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the atomic number of an atom?
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The number of atoms it contains.
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The number of protons it contains.
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The number of neutrons it contains.
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None of the above
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Explanation:
Detailed explanation-1: -The atomic number of an atom is equal to the number of protons in the nucleus of an atom or the number of electrons in an electrically neutral atom. For example, in a sodium atom, there are 11 electrons and 11 protons.
Detailed explanation-2: -The atomic number is the number of protons in an atom, and isotopes have the same atomic number but differ in the number of neutrons.
Detailed explanation-3: -atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number.
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