When comparing the two species se2− and sr2+ the larger of the two is?

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Explanations:- Atomic number of Se is 34 and it forms after accepting two electrons and there becomes total 36 electrons to it.

Atomic number of Sr is 38 and it forms on losing two electrons from it's valence shell and there also becomes total 36 electrons to it.

Now, both of these are isoelectronic means having with equal number of electrons but the cation(positively charged ion) has more protons as compared to the anion(negatively charged ion) and because of this it has more effective nuclear charge and it's size is smaller.

The anion has less effective nuclear charge and so it's size is bigger.

Hence, the right choice is .

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

-love shrooms