The Elements of the Modern Periodic Table

Q.

Define reducing power and explain its trend in the periodic table.

Q.

Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy) is:

(i)$\mathrm{F}>\mathrm{Cl}>\mathrm{Br}>\mathrm{I}$

(ii) $\mathrm{F}<\mathrm{Cl}<\mathrm{Br}<\mathrm{I}$

(iii) $\mathrm{F}<\mathrm{Cl}>\mathrm{Br}>\mathrm{I}$

(iv) $\mathrm{F}<\mathrm{Cl}<\mathrm{Br}<\mathrm{I}$

1. (i)

2. (ii)

3. (iii)

4. (iv)

Q.

Why noble gases are called inert gases?

Q.

What is Group 0 called?

Q. What will be the name of an element with atomic number 116?

1. Ununhexium
2. Unnilhexium
3. Ununseptium
4. Ununennium

Q.

How many neutrons are present in an element with mass number 35, atomic number 17 ?

Q. Electron gain enthalpy of chlorine is than sulphur.

1. less negative
2. more negative
3. more positive

Q. The IUPAC name of an element with atomic number 118 is

1. unniloctium
2. unoctium
3. ununoctium
4. unoctoctium

Q.

The elements A and B have electronic configurations 2, 8, 18, 2, and 2, 6 respectively.

1. To which period do A and B belong in the modern periodic table.
2. To which group do A and B belong in the modern periodic table.

Q. belongs to group 18 and has valence electrons.

1. Neon
2. 7
3. Fluorine
4. 8

Q.

Choose the odd one out. Give reasons for your choice.

helium, neon, argon, oxygen, xenon

Q.

Calculate the number of neutrons in the following element:

${}_{20}{}^{40}\mathrm{Ar}$

Q. For a neutral atom containing 6 electrons and 7 neutrons, the number of protons would be .

1. 7
2. 6
3. 13

Q.

Write the formulae of the following chemical compounds:
Dinitrogen trioxide

Q.

Name or state the following:

An element having valency zero.

Q.

4. Derive the molecular formulae of the following compounds stepwise and give their atomicity.

v. sodium nitrate

Q.

Are zero group elements and ${18}^{\mathrm{th}}$ group elements are same?

Q.

Differentiate between:

Periods and groups.

Q.

Newlands octave theory was, based on atomic weight while Julius Lothar Meyers classification was based on valence of elements. is, the Mendeleevs periodic table based on atomic weight or valence.

Q.

With reference to the long form of the periodic table fill in the blank spaces with appropriate words.

_______ metals and alkaline ________ metals are placed in groups IA and ___________ respectively on the left hand side of the periodic table.

Q. Elements of a group have similar chemical properties.

1. True
2. False

Q. Read the given statements carefully.
(a) There are total of 7 columns in the Modern periodic table.
(b) Mendeleev arranged the elements in the increasing order of their atomic numbers and according to their chemical properties
(c) Newlands’ law of Octaves worked well with lighter elements only.
The correct statement(s) is/are

1. Only (b)
2. Only (c)
3. Only (a)
4. Both (a) and (b)

Q. Elements with configuration 2, 8, 2 and 2, 7 are placed in modern periodic table. Find out:
1. the valency of the elements mentioned above.
2. the period and group of the above elements.

Q. Element ‘X’ (Atomic number = 10) is a gas present in the group 18 of the modern periodic table and element ‘Y’ is the metalloid present in the $3^{rd}$ period of the Modern periodic table. Based on this information choose the incorrect statement(s).

1. The element present just before element ‘X’ in the ${17}^{th}$ group is the most electronegative element of the Modern periodic table.
2. Number of valence electrons present in element ‘Y’ is 4.
3. Element ‘Y’ was known as eka-silicon in the Mendeleev’s periodic table.
4. Valency and period number of element ‘X’ is 0 and 2 respectively.

Q. Burst the bubbles for the elements present in the second period.

1. Na
2. Li
3. Mg
4. Be
5. B
6. C
7. Ne
8. Cl

Q.

Which group of elements include lithium, sodium, potassium, rubidium, caesium, and francium?

1. Group 17

2. Group 1

3. Group 2

4. Group 18

Q.

How many neutrons are there in ${}_{92}^{238}\text{U}$?

1. 148
2. 146
3. 144
4. 92

Q. Which of the following elements has a controversial placement in modern periodic table?

1. Helium
2. Silicon
3. Hydrogen
4. Carbon

Q. Which of the following elements has a controversial placement in modern periodic table?

1. Helium
2. Silicon
3. Hydrogen
4. Carbon

Q.

Which element can be placed in the region marked by question mark ?

1. Ga (Gallium)

2. Br (Bromine)

3. Si (Silicon)

4. I (Iodine)