What is the number of electrons in the following ion?
Correct answer: A. 28
- A. 28
- B. 29
- C. 30
- D. 34
Explanation
No of electrons = no of protons = atomic number in a neutral atom. Since Ga-69 has atomic number 31 so its number of electrons is also 31 however by to question which is concerned with the number of electrons in Ga+3 ion, meaning this atom has lost 3 electrons so we subtract 3 from 31, we get 28. So the number of electrons in Ga+3 ion is 28. Hence option A is correct.
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Electronic configuration describes how electrons occupy shells, subshells and orbitals around an atom. Questions use the Aufbau principle, Pauli exclusion principle and Hund's rule to write configurations, identify valence electrons, form ions and explain periodic trends, including common exceptions such as chromium and copper.
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