Which element has quantum numbers 3 1 0 -1/2

The element is Aluminium. (assuming that the given quantum number set is for the valence electron of the unknown element)

Explanation:

The given quantum numbers are:

n=3 (Principal Quantum Number)

l=1 (Azimuthal Quantum Number)

m=0 (Magnetic Quantum Number)

s= -1/2 (Spin Quantum Number)

The given set of quantum numbers refer to the 3p orbital.

Assuming that this the valence electron of the element, the unkown element is Aluminium.

answer; i do believe the correct answer is (river); /// good luck

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%