Refer to the periodic table and predict which of the following ions are isoelectronic with the noble

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Refer to the periodic table and predict which of the following ions are isoelectronic with the noble gas argon.

(a) Al3+ 

(b) Ca2+

(c) S2–

(d) N3–.

Periodic Table:

2 3 4 10 6 3 7 11 Li 6.94 1 IA Na 22.99 19 37 5 Rb K 39.10 al 55 4 87 2 IIA Fr (223) Be 9.01 12 Mg 24.31 Sr

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