Modern Periodic Table

Q. Electronic configuration of $F{e}^{3+}$ ion is given corrrectly by

1. $1s^2,2s^{2}2p^6,3s^{2}3p^{6}3d^6,4s^2$
2. $1s^2,2s^{2}2p^6,3s^{2}3p^{6}3d^5$
3. $1s^2,2s^{2}2p^6,3s^{2}3p^{6}3d^5,4s^1$
4. $1s^2,2s^{2}2p^6,3s^{2}3p^{6}3d^8$

Q. What is meant by periodicity of an element?

Q.

Element X forms a chloride with the formula XCl₂, which is solid with a high melting point. X would most likely be in the same group of the Periodic Table as

1. Sodium (Na)

2. Magnesium (Mg)

3. Aluminum (Si)

4. Silicon (Si)

Q.

Name the three categories in which all the elements are classified.

Q.

Write the electronic configuration of alkali metals.

Q.

Explain typical elements in the periodic table.

Q.

Define gram atom.

Q.

What are metalloids? Give two examples. [3 MARKS]

Q.

Lithium, sodium and potassium form a Dobereiner’s triad. The atomic masses of lithium and potassium are 7 and 39 respectively. Predict the atomic mass of sodium. [2 MARKS]

Q.

What is the symbol of silver?

Q.

What are the merits and the limitations of Mendeleevs periodic table?

Q.

How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?

Q.

State the main components present in duralumin.

Q. An element X belongs to the 3rd period and group 15 of the modern periodic table.​ What is the atomic number of element X?

1. 15
2. 7
3. 3
4. 18

Q.

How many Elements are in the first Period of the periodic table ?

Q. An element X belongs to group 14 and $2^{\text{nd}}$ period of the periodic table. Its atomic number will be:

1. Six
2. Fourteen
3. Fifteen
4. Seven

Q.

Write the valency of cations present in the following compound:

Copper (II) Sulphate

Q. Representative elements belong to

1. f-block only

2. d and f-block

3. s and p-block

4. p and d-block

Q.

Who developed the long form of periodic table?

1. Lothar Meyer

2. Niels Bohr

3. Mendeleef

4. Moseley

Q. According to Moseley's periodic law the physical and chemical properties of elements are the periodic function of their atomic .

1. structures
2. masses
3. numbers

Q.

According to modern periodic law, the properties of elements are a periodic function of their ___ .

1. atomic masses

2. atomic volumes

3. atomic numbers

4. densities

Q. What is the correct increasing order of electron affinity for the given elements?

[1 mark]

1. N < O < Cl < Al
2. Al< O < N < Cl
3. Al < N < O < Cl
4. N < O < Al < Cl

Q. According to modern periodic law, the properties of elements are a periodic function of their atomic numbers.

1. False
2. True

Q.

Name the chief ore of Iron. Write its formula

Q.

What is the element 128?

Q. An element has $2$ electrons in its $N$ shell,
(iv) State the name assigned to this group.

Q.

Define F block elements in the modern periodic table.

Q. Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (any two)

Q.

What is an element? Name any five elements.

Q.

Explain the malleability of metals.