Question

correct order of increasing size of the elements Li,Cu,F,and Ne

Answer 1

Answer:

In a period as outer most shell remains same and the difference comes only with number of protons that is nuclear charge. As we move from left to right nuclear charge increases this increases the affect of nuclear charge on the outer most shell making radius decrease. Hence, fluorine is at the end in the 2nd period and lithium comes first in this period after lithium, beryllium and then nitrogen.

F<N<Be<Li.