$Be^{2+}$ is isoelectronic with:
- A$Mg^{2+}$
- B$Na^{+}$
- C$Li^{+}$
- D$H^{+}$
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Elements having different nuclear charge but the same mass number are called
MediumAIPMT 1991
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$(i) \, _{32}Ge^{77}$
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$(iii) \, _{34}Se^{77}$
$(iv) \, _{34}Se^{78}$
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