Which elements have similar chemical properties? a) Na, K, Mg
b) B, Al, S
c) N, O, F
d) He, Ar, Kr

d) He, Ar, Kr

Explanation:

To have similar chemical properties, elements must belong to the same period on the periodic table.

As a generally periodic trend, elements within the same group, have the same chemical properties.

So, the correct answer choice will draft elements from the same group.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter