The answer should be c)4.8
I think the answer would be b
What do you mean? You’re not giving us the rest of the question
"Every accomplishment starts with the decision to try." "As we express our gratitude, we must never forget that the highest form of appreciation is not to utter words, but to live by them." "Those who dare to fail miserably can achieve greatly." "The ignorance of one voter in a democracy impairs the security of all."
Atomic radii INCREASES when going DOWN a group because of more energy levels and DECREASES going ACROSS a group because of the increasing positive charge of the nucleus pulling in on the electrons.