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Which one of the following groupings represents a collection of isoelectronic species:
(1) NA+, Ca2+, Mg2+
(2) N3, F-, Na+
(3) be, Al3+, Cl-
(4) Ca2+, Cs+,Br
Ans: N3, F-, Na+
Which forms a crystal of Nacl: (1) Nacl molecules (2) Na + and cl - ions (3) Na andcl atoms (4) None of the above Ans: Na + and cl - ions
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