Electron in the n = 4 state with ml = 2, what are the possible values of l?

l= 2, 3

Explanation:

Given the principal quantum number, n, we have that the angular momentum number from 0 to n-1, and the magnetic quantum number can have the values from - l to + l.

For n= 4 ( principal quantum number ) , we have that l, angular quantum number,  can  have the values 0, 1, 2, 3, and for each l value ml, magnetic quantum number, can have the values from - l  to + l :

ml ( for l=0 ) : 1   (s orbital)

ml ( for l= 1 ) : -1, 0, +1 ( p orbitals )

ml ( for l= 2 ) : -2,-1,0,+1,+2 ( d orbitals )

ml ( for l= 3 ) : -3,-2,-1,0+,1,+2 (f orbitals )

So we see that the possible values of l for ml = 2 are l= 2 and l=3

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.