Electronic Configuration

Q. Arrange the following orbitals in the increasing order of their energies.

1. 2s
2. 2p
3. 3s
4. 3p
5. 4s

Q.

How many valence electrons are in an atom of chlorine?

Q.

What is the formula of aluminium?

Q. Identify the electronic configuration of carbon atom from the given options.

1. $1s^2$ $2s^2$ $2p^2$
2. $1s^2$ $2s^1$ $2p^3$
3. $1s^2$ $2s^2$ $3p^2$
4. $1s^2$ $2s^2$ $3p^3$

Q.

What is the valency of Calcium carbonate?

Q.

Is N and O ionic or covalent?

Q. Consider the following elements and their electronic configurations
X = 2, 8, 7
Y = 2, 8, 3
Z = 2, 8, 5
Now, choose the correct option.

1. Only Z is a metal
2. Only X is a metal
3. Y is a metal but Z is a non-metal
4. X is a non-metal but Z is a metal

Q.

______ is more reactive than bromine.

Q. Draw the electron dot diagram and structure of​
(b) magnesium chloride​

Q.

The electron distribution in an aluminium atom is?

1. $2,3,8$

2. $2,8,2$

3. $2,8,3$

4. $8,2,3$

Q. 1.In GaCl2 the oxidation state of Ga is (1) +1 (2) +2 (3) +3 (4) Both (1) and (3)

Q.

Ferric ion takes up _____ electrons to convert to ferrous ion

Q. The successive ionization energies for element X is given below IE1 250 kJ mol-1 IE2 820 kJ mol-1 IE3 1100 kJ mol-1 IE4 1400 kJ mol-1 Find out the number of valence electron from element X.

Q.

What will determine the valency of an element?

How to identify the type of bond it forms?

Q.

What are shells?

Q.

An element is represented as${}_{20}^{40}\text{X}$. Find the number of valence electrons in it.

1. 2

2. 3

3. 1

4. 4

Q.

Covalency is the number of electron pairs

1. gained

2. transferred

3. shared

4. donated

Q. An element has its electronic configuration as 2, 8, 2. Now answer the following questions according to modrn periodic table.
a. What is the atomic number of this element?
b. What is the group of this element?
c. To which period does this element belong?
d. With which of the following elements would this element resemble?
(Atomic numbers are given in the brackets)
N (7), Be (4) , Ar (18), Cl (17)

Q.

What is valency? Discuss the classification of elements based on the valency.

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Why are ionic compounds stable?

Q.

The maximum number of electron in the first shell can be 8.

1. True
2. False

Q. Write the electron-dot structure for sodium, oxygen and magnesium.

Q. In Newlands' periodic table, some elements with different properties were placed in the same group.

1. True
2. False

Q. Which of the following electronic configuration of oxygen $\left(\text{O}\right)$ atom is correct?

1. $$\begin{array}{c}\upharpoonleft \end{array}\begin{array}{c}\upharpoonleft \downharpoonright \end{array}\begin{array}{ccc}\upharpoonleft \downharpoonright & \upharpoonleft \downharpoonright & \upharpoonleft \end{array}$$
2. $$\begin{array}{c}\upharpoonleft \downharpoonright \end{array}\begin{array}{c}\upharpoonleft \end{array}\begin{array}{ccc}\upharpoonleft \downharpoonright & \upharpoonleft \downharpoonright & \upharpoonleft \end{array}$$
3. $$\begin{array}{c}\upharpoonleft \end{array}\begin{array}{c}\upharpoonleft \end{array}\begin{array}{ccc}\upharpoonleft \downharpoonright & \upharpoonleft \downharpoonright & \upharpoonleft \downharpoonright \end{array}$$
4. $$\begin{array}{c}\upharpoonleft \downharpoonright \end{array}\begin{array}{c}\upharpoonleft \downharpoonright \end{array}\begin{array}{ccc}\upharpoonleft \downharpoonright & \upharpoonleft & \upharpoonleft \end{array}$$

Q.

Chlorine generally forms:

1. Anions

2. Cations

3. Data Insufficient

4. Both cations and anions.

Q. What do you understand by the following terms valency, valence electrons and valence shell?

Q. A molecule of ammonia $\left({\text{NH}}_3\right)$ has:

(a) Only single bonds
(b) Only double bonds
(c) Only triple bonds
(d) One double bond and remaining are single bonds

Q. How many electrons are there in the outermost shell of group 18 elements?

Q.

Give the electronic configuration of the following element.

Magnesium

Q. Which element has a total of three shells, with four electrons in its valence shell?