For an element in Period 10 on the periodic table: Set of quantum number for ele

Question

For an element in Period 10 on the periodic table:

Set of quantum number for element

n = 7, l = 4, ml = -3, and ms = +1/2

The electron with the above set of quantum numbers was the last electron to enter into the ground state for the (as of now) undiscovered element in period 10. The sublevel to which this electron entered (l =4) is now 1/2 full and the s orbital that would be filled prior to electron entering the n=7, l=4 orbital is full.

a) How many electrons are in this half-filled sublevel (l=4)?

b) What letter would be given as the name to symbolize this sublevel (l = 4) to which this last electron entered?

c) What is the atomic number of this element?

d) What is the atomic number of the halogen element in period 10?

Explanation / Answer

a) How many electrons are in this half-filled sublevel (l=4)?

if l = 4 the sub orbital is 'g'

the total number of electrons filled in that sub orbital = 18

if it is half-filled the number electrons filled = 9

b)

the letter would be given when l = 4 sub level is   'g'

c)

the atomic number is 169

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