Question: How many subatomic particles are present for the selenium ion (Se 2 )? In which of the following groups do the species have the same

How many subatomic particles are present for the selenium ion (Se2)?

In which of the following groups do the species have the same number of electrons?

Question 2 options:

Na+, Ne, F-

Li+, Na+, K+

Br, Kr, Rb

O2-, S2-, Se2-

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