Answer:- ![Se^2^-](https://tex.z-dn.net/?f=Se%5E2%5E-)
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
.
Answer:becus they dont want u go tp center
Explanation:
thy dont want u diggin to da center of da earth
Answer:
Sun at the center.
Explanation:
The actual dictionary definition of Heliocentric defines it as, "Heliocentrism is the astronomical model in which the Earth and planets revolve around the Sun at the center of the Solar System. Historically, heliocentrism was opposed to geocentrism, which placed the Earth at the center."
2.6394*10^22 is the answer