The model below shows a calcium atom. How many electrons are in the third energy level?
O 2
O 8
O 18
O 20
og

first energy level:1s2=2 electrons

2nd energy level:2s2 2p6=8 electrons

3rd energy level 3s2 3p6=8 electrons

B.8

Explanation:

Ca=20

K L M N

2 8 8 2

The third energy level of an atom (with atomic number 20 and above) contains 8 electrons.

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

hope this : )

and after water is usually warmed by the sun the water temperature raises and then evaporates .