Question

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Calculate the number of protons, electrons and neutrons in a magnesium atom, given that the atomic number and atomic mass number of magnesium atom is 12 and 24 respectively​.

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Answer 1

Answer:

Concept Applied: Number of protons is equal to atomic number. An atom forms positively charged ion by losing electrons.

Correct Option: D

Explanation for correct option:

∙ The atomic number (Z) of magnesium atom = 12.

∙ For neutral atom,

Number of protons (p) = Number of electrons (e) = Atomic number (Z)

∙ So, number of protons in the nucleus of magnesium atom = atomic number = 12

∙ Now, for Mg

+2

, number of electrons = 12 - 2 = 10 (because positive charge is acquired by losing electrons)

∙ But, the number of protons remains the same, i. e. 12.

∙ Thus, the correct answer is 10, 12.

Conclusion: Mg

+2

ion contains 10 electrons and 12 protons.

Answer 2

Answer:

calculate the number of protons neutrons and electrons

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