Which elements have the most similar properties? A. K and Mg
B. O and N
C. Ne and Ar
D. Na and Nb

K and Mg

Explanation: This is because: Discussion of calcium is often paired with magnesium, and for good reason. As neighbors on the periodic table, they have similar chemical properties and behave similarly in several chemical reactions. They share some regulatory mechanisms and act in many of the same physiologic arenas.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.