It is because all these three elements contain ionic properties and they have only one element in their outermost shell
C. Is the answer for sure
<em>At noon the sun is directly overhead the sun rays fall vertically on the body so the shadow is very short.</em>
<em>So the rays fall vertically on the body. in mornings and evenings the rays fall at inclined position. So shadows are long at mornings or evenings.</em>
