Two electrons are found in the same atom. one has the quantum number set (3, 2, 0, + and the other has the quantum number set (3, 1, 0, + they share thea same sub level but differentt orbitalsb same orbital but different spin directionsc same energy level but different sublevelsd same type of sub level but found in different energy sub levels

D. Same energy level but different sublevel.

There are four quantum numbers [1]:

As their names might suggest:

The two electrons in question come from the same atom. The question suggests that they have the same n, , and . As a result, both electrons are in main energy level n = 3. They share the same spin.

However, the two electrons differ in their value of l.

[1] Kamenko, Anastasiya, et. al, "Quantum Numbers", Physical & Theoretical Chemistry, Chemistry Libretexts, 24 Mar 2017.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b