A container is initially filled with pure SO3. After a period of time, the following equilibrium is established:
2SO(g) + O2(g) ⇄ 2SO3(g)
K eq= 7.0 * 10^25
What does this equilibrium mixture contain?

A. mostly reactants
B. equal amounts of reactants and products
C. mostly products
D. 60% reactants and 40% products

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

a:

by the combination of an unlimited number of elements

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.