Correct Answer - Option 4 : 2
Valence electrons: Number of electrons present in outermost shell of atom are called valence electrons.
- The number of valence electrons present in Aluminum (Al) is 3.
- An atom is electrically neutral due to equal no. of protons and electrons.
- The loss of electrons makes it positively charged and the magnitude of positive charge is equal to the number of electrons lost.
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Hence, Al atom has 3 valance electrons and on becoming Al+ ion, it loses 1 electrons. Therefore, remaining valance electrons = 2