Electronic Configuration

Q.

What is the electronic configuration of nitrogen?

Q.

What is the electron configuration of arsenic?

Q. $1cc{N}_{2}O$ at $NTP$ contains _____.

1. $\frac{6.02}{22400}\times {10}^{23}$ molecules
2. $\frac{1.32}{224}\times {10}^{23}$ electrons
3. $\frac{1.8}{224}\times {10}^{22}$ atoms
4. All the above

Q.

How many unpaired electrons are there in ${\mathrm{Ni}}^{+2}$?

Q.

What is the electronic configuration of Fluorine?

Q.

What is the ground-state electron configuration of the element $\mathrm{Kr}$?

Q.

What is the difference between valency and valence electrons?

Q. Lanthanoid which is well known to exhibit $+4$ oxidation state is:

1. Cerium
2. Promethium
3. Europium
4. Ytterbium

Q.

What is the electron configuration of a nitrogen molecule?

Q.

Anomalous electronic configuration in the $3\mathrm{d}$ series are of

1. $\mathrm{Cu}\mathrm{and}\mathrm{Zn}$

2. $\mathrm{Cr}\mathrm{and}\mathrm{Fe}$

3. $\mathrm{Fe}\mathrm{and}\mathrm{Cu}$

4. $\mathrm{Cr}\mathrm{and}\mathrm{Cu}$

Q.

How to memorize or guess colour of any compound?

Q. Which of the following is not a permissible set of quantum numbers for an electron?

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

Q.

Why does Scandium not show a plus 2 oxidation state?

Q.

Find out the applications of all the inert gases.

Q. How does the electronic configuration in atoms change in a period from left to right?

Q. Electron gain enthalpy of Noble Gas is almost Zero . Justify

Q. Azimuthal quantum number defines:

1. $e/m$ ratio of electron.
2. angular momentum of electron.
3. spin of electron.
4. magnetic momentum of electron

Q.

Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states? [CBSE AIPMT 2009]

1. $3d^3,4s^2$

2. $3d^5,4s^1$

3. $3d^2,4s^2$

4. $3d^5,4s^2$

Q.

What is the gas present in the space

Q.

Why Phosphorus has d orbital?

Q. According to CFT, the bond between ligand and metal atom/ion is

1. ionic
2. covalent
3. metallic
4. coordinate

Q.

Write the electronic configurations of the following ions:
(a) $H^{–}$
(b) $N{a}^{+}$
(c) $O^{2–}$
(d) $F^{–}$

(ii) What are the atomic numbers of elements whose outermost electrons are represented by
(a) 3$s^1$
(b) 2$p^3$ and
(c) 3$p^5$ ?

Which atoms are indicated by the following configurations?
(a) [He] 2$s^1$
(b) [Ne] 3$s^{2}3p^3$
(c) [Ar] 4$s^{2}3d^1$

Q.

Why are Lanthanides colored?

Q. The number of unpaired electrons in the uranium ${(}_{92}U)$ atom is:

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

Q.

Assign the position of the element having outer electronic configuration
(i) n$s^2$ n$p^4$ for n = 3

(ii) (n - 1)$d^2$ n$s^2$ for n = 4,

(iii) (n - 2) $f^7$ (n - 1)$d^1$ n$s^2$ for n = 6, in the periodic table.

Q.

Bleaching action of chlorine is due to:

1. Reduction

2. Oxidation

3. Close shell electronic configuration of chlorine

4. Ionisation

Q. If there were $8$ periods in the periodic table and each orbital could have a maximum of $5$ electrons, then what is the maximum number of elements that would be present in period $8$?

1. $125$
2. $135$
3. $150$
4. $50$

Q. Which of the following elements is unable to form $M{F}_6^{3-}$ ions?

1. $B$
2. $Al$
3. $Ga$
4. $In$

Q. How many nodal planes are there in atomic orbitals corresponding to the principal quantum number $n=3$?

1. 9
2. 11
3. 13
4. 15

Q.

The number of valence electrons in argon (Z=18) is

1. 8

2. 6

3. 4

4. 0