Atomic number of calcium is 20. Calculate the number of electrons in calcium.

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Solution

Atomic number = number of protons = number of electrons

Therefore, number of electrons in calcium = 20.

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The atomic number of the element calcium is 20. The total number of electrons in calcium is

An ion $X^{2 +}$ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.

C a = 40

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