Multiple choice Which of the following species is/are isoelectronic? (1) NH3(2) CH3+(3) NH2-(4) NH4+ Only (1), (2) and (3) Only (2), (3) and (4) Only (1), (2) and (4) Only (1), (3) and (4) None of these Reveal answer Fill a bubble to check yourself D Correct answer Explanation This option is correct because 1, 3 and 4 species are isoelectronic having 10 electrons.