The most common form of calcium has 20 protons, 20 neutrons, and 20 electrons. Which of the following?

The most common form of calcium has 20 protons, 20 neutrons, and 20 electrons. Which of the following elements would be an isotope of calcium?

a)an atom with 20 protons, 21 neutrons, and 20 electrons

b)an atom with 20 protons, 20 neutrons, and 18 electrons

c)an atom with 21 protons, 20 neutrons, and 21 electrons

d)all of the above

e) none of the above

6 Answers

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  • Anonymous
    1 decade ago
    Best Answer

    a) an atom with 20 protons, 21 neutrons, and 20 electrons

    A isotope is an atom with the same number of protons in the nucleus, but a different number of neutrons.

  • 1 decade ago

    A).

    An isotope is the form of an element with a different number of neutrons but the same number of protons, as the answerer above me said.

  • 1 decade ago

    yes A

  • Anonymous
    1 decade ago

    a

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  • 1 decade ago

    a) i'm positive

  • 1 decade ago

    B)

    Source(s): ME
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