Question

write the 4 quantum numbers for differentiating electrons of lithium (li) atom.​

Answer 1

Explanation:

$\huge\bf{\mid{\overline{\underline{ANSWER:-}\mid}}}$

Four quantum numbers are:-

• Principal quantum number (n)

The principal quantum determines the size and energy of the orbital. n can have positive integer values like 1,2,3.... .Each principal quantum number represents an energy shell in the atom

n = 1 , 2 , 3 , 4

shell = K , L , M , N

• Azimuthal quantum number (l)

Azimuthal quantum number is also known as orbital quantum number. Each shell consists of one or more Azimuthal shell.Ex :- 1s² ( 1 azimuthal shell) 2s² 2p³ (2 Azimuthal shell) . Azimuthal quantum number also tells shape of orbitals in 3-D.

Value of (l) = 0 , 1 , 2 , 3 ,...

Symbol of subshell = s , p , d , f ,....

• Magnetic Quantum number (m)

For a given value of (l) [azimuthal quantum number] ,m can take value of range [ -l to +l] .

The spatial orientation of orbital w. r. t standard set of co-ordinate axis is determined by magnetic quantum number.

$\boxed{ \begin{tabular}{ c | l } </p><p>l & m \\ </p><p>\cline {1 - 2} </p><p>0(s) & 0 \\</p><p>l(p) & -1 , 0 , 1 \\</p><p>2(d) & -2, -1, 0 , 1 , 2 \\</p><p>3(f) & -3 , -2, -1 , 0 , 1 , 2 , 3 </p><p> \end{tabular}}$

• Spin Quantum number (s)

An electron spins around its own axis. Spin angular momentum has two orientation.The two orientation are + 1/2 and -1/2

$\boxed{ \uparrow \: \downarrow}$

Now let's solve the question..

For lithium,

it has 3 electrons

1s² , 2s¹

Principal quantum number is => 2

Azimuthal quantum number is => 0 (s-subshell)

Magnetic quantum number => 0 (s-subshell)

Spin quantum number for 2s¹ is => + 1/2

Answer 2

QUANTUM NUMBERS

n ------- 2

l-------- 0

ml------- 0

ms-------- 1/2