During which era did the supercontinent pangaea break up?
a- paleozoic
b- mesozoic
c- precambrian
d- cenozoic

the correct answer is option d

explanation:

i was wrong its d because they dont use cm when calculating square roots

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

thats a little if u want the answer just look it up on google thats what i do haha : )

im not exactly sure but i think its b!