Question

Helium (H), oxygen (O), carbon (C) and selenium (Se) are all in the nonmetals group. Using the periodic table, which pair of these nonmetals has the most similar properties? (1 point)

oxygen and selenium

helium and selenium

oxygen and helium

carbon and oxygen

Answer 1

Oxygen and selenium
Because they in the same group
helium and selenium are not in the same group therefore wrong
Carbon and oxygen are in the same period but NOT IN THE SAME PERIOD
carbon and helium aren't in the same period.
As i said earlier the same characteristics are seen in the elements in the same group. SO the answer is A Oxygen and selenium.