Aufbau Principle

Q. For a sodium atom, the number of electrons with m = 0 will be:

1. 7
2. 8
3. 9
4. 2

Q. The four quantum numbers for the valence shell electron of sodium (Z = 11) is ___________.

1. $n=2,l=1,m=-1,s=+\frac{1}{2}$
2. $n=3,l=0,m=0,s=+\frac{1}{2}$
3. $n=3,l=2,m=-2,s=-\frac{1}{2}$
4. $n=3,l=2,m=2,s=+\frac{1}{2}$

Q.

Which molecule has the highest bond order?

1. Li2

2. He2

3. O2

4. N2

Q.

The electronic configuration of Phosphorus (atomic number 15) will be:

1. 2 , 8 , 7

2. 2, 8, 6

3. 2, 8, 5

4. 2 , 8 , 4

Q. The maximum number of electrons in a shell can be calculated by the formula _______.

1. ${\text{n}}^{\text{2}}$
2. $\text{n}$
3. $\text{2n}$
4. ${\text{2n}}^{\text{2}}$

Q. Electronic configuration of strontium =38= 2, 8, 18, 8, 2
But I have doubt that why 18 is taken?
Kindly describe.

Q. Electronic configuration of an element with atomic number 15 is:

1. 2, 8, 5
2. 2, 5, 8
3. 5, 2, 8
4. 8, 2, 5

Q. The electrons in the orbitals are filled in order of increasing energy.

1. True
2. False

Q. An atom of an element has the electronic configuration $2,8,2$. To which group does it belong?

1. $4^{th}$ group
2. $6^{th}$ group
3. $3^{rd}$ group
4. $2^{nd}$ group

Q.

Which of the following violates Hund's rule?

1. 

2. 

3. 

4. 

Q. Which of the following electronic configuration represents neon?

1. $1s^{2}2s^{2}2p^{6}3s^1$
2. $1s^{2}2s^{2}2p^6$
3. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^1$
4. $1s^{2}2s^{2}2p^{6}3s^2$

Q.

How we can write electronic configuration of subshell and need eg

Q.

The element X in group 17 has 3 shells. If so,

i. Write the subshell electronic configuration of the element.

ii. Write the period number,

iii. What will be the chemical formula of the compound formed if the element X reacts with element Y of the third period which contains one electron in the p subshell?

Q. According to Aufbau principle, the increasing order of energies of 3d, 4s, and 4p orbitals is:

1. 4s < 4p < 3d
2. 4p < 3d < 4s
3. 4s < 3d < 4p
4. 3d < 4s < 4p

Q. The _____ orbital is filled immediately after the 3p orbital.

1. 4s
2. 3d
3. 4p
4. 4d

Q. Which of the following is true for Pauli Exclusion Principle?

1. None of the above
2. The orbitals of equal energy (degenerate) are occupied with one electron each before pairing of electrons starts.
3. No two electrons of the same atom can have all the four quantum numbers same.
4. The lowest-energy orbitals are filled first.

Q.

According to the Aufbau Principle, the correct order of energy of 3d, 4s and 4p orbitals is:

1. 3d<4s<4p

2. 4s<3d<4p

3. 4s<4p<3d

4. 4p< 3d<4s

Q. Write the electronic configuration of chromium and copper:

Q. The correct set of values of $\text{n},\text{l},{\text{m}}_{\text{l}}$ and ${\text{m}}_{\text{s}}$ for the singly occupied $1s^1$ orbital is:

1. $n$ = 1, $l$ = 0, $m_l$ = -1, $m_s$ = 0
2. $n$ = 2, $l$ = 0, $m_l$ = -1, $m_s$ = 0
3. $n$ = 1, $l$ = 1, $m_l$ = -1, $m_s$ = -1/2
4. $n$ = 1, $l$ = 0, $m_l$ = 0, $m_s$ = + 1/2

Q. Maximum number of electrons that can occupy s, p, d and f sub shells respectively are:

1. 4, 5, 6, 7
2. 2, 6, 10, 14
3. 2, 4, 8, 16
4. 1, 2, 3, 4

Q. s-subshell can accommodate a maximum of ______ electrons.

1. four
2. six
3. two
4. ten

Q. The electronic configuration of Al is : [ 1 Mark]
a) 1s² 2s² 2p⁶ 3p³
b) 1s² 2s² 2p⁶ 3s³
c) 1s² 2s² 2p⁶ 3s² 3p¹
d) 1s² 2p⁸ 3s² 3p¹

Q. Which of following orbital has maximum energy?

1. $n=3,l=0,m=1$
2. $n=3,l=1,m=0$
3. $n=3,l=2,m=0$
4. $n=4,l=0,m=0$

Q.

Tell me the different properties of electronic congregation or quantum numbers .

Q. The maximum number of electrons that can be accommodated in the $\text{L}$ shell of an atom is:

1. 2
2. 6
3. 8
4. 3

Q.

Which of the following correctly represents the electronic distribution in the Mg atom?

1. 3, 8, 1

2. 2, 8, 2

3. 1, 8, 3

4. 8, 2, 2

Q.

How many electrons in an atom may have the following quantum numbers?
(a) n = 4, $m=-\frac{1}{2}$
(b) n = 3, l = 0

Q. All elements achieve octet configuration by-
(select all suitable options)

1. Gaining electrons
2. Losing electrons
3. Sharing electrons
4. Creating electrons

Q. what are. s p d f. electronic configuration

Q. An atom x has 2, 8, 7 electrons in it shell. it combines with y having 1 electron in its outermost shell.
a). what type of bond will be formed between x and y?