SCIENCE
ECOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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How many protons are in an atom with an atomic number of 20, an atomic mass of 45, and a charge of +2?
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20
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10
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2
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18
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Explanation:
Detailed explanation-1: -How many protons are in an atom with an atomic number of 20, an atomic mass of 45, and a charge of +2? answer choices. 20.
Detailed explanation-2: -Therefore, number of neutrons = 20.
Detailed explanation-3: -For example, calcium (Ca) has an atomic number of 20. This means that all calcium atoms contain 20 protons. A neutral atom of calcium will also have 20 electrons.
Detailed explanation-4: -If it will have a charge of +2 then there is loss of 2 electron, therefore electron in Ca2+ ion in 18 electrons And no. of electrons do not depend on mass.
Detailed explanation-5: -The calcium-40 isotope has a mass number of 40, and an atomic number of 20, therefore it has 20 protons.
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