Periodic Table Dalal Simplified ICSE Chemistry Class-10 Solutions Chapter 1.  Solutions of Dr Dalal Simplified ICSE Chemistry Chapter-1 Periodic Table by Dr Viraf and J Dalal for Class 10. Step by step Solutions of Dr Dalal Simplified ICSE Chemistry by Dr Viraf and J Dalal of Periodic Table Dalal Simplified Chemistry.

## Periodic Table Dalal Simplified ICSE Chemistry Class-10

### How to Solve Periodic Table ICSE Chemistry Class-10

Note:– Before viewing Solutions of Periodic Table by Dr Viraf and J Dalal Simplified ICSE Chemistry Solutions of Chapter-1 .Read the Chapter-1 Periodic Table Carefully to understand the concept in better way .After reading the Chapter-1 Periodic Table solve all example of your text book For more practice on Periodic Table  try to solve exercise of other publications also such as Goyal Brothers Prakshan Chemistry  / Concise Selina Publications Chemistry.

### Question 1.

State the fundamental property on which the modern periodic table or long form of periodic table is based.
Properties of the elements are periodic function of their atomic number.

#### Question 2.

State the important salient features of the modern periodic table. State how separation of elements and periodicity of elements forms an important feature of the modern periodic table.
Physical and chemical properties of elements are periodic functions of their atomic number.
Salient Features of Modern Periodic Table –

1. This table has a eighteen veritcal columns called groups or families.
2. The groups are IA to VILA, IB to VIIB, VIII (three columns) and zero group.
According to the latest recommendations of the International Union of Pure and Applied Chemistry (I.U.P.A.C.), the groups are numbered 1-18.
3. The group number is assigned to an element depending upon the number of the valence electrons.
4. Elements included in the same group of the periodic table have similar outer electronic configuration and constitute a family of chemically similar elements.

#### Question 3.

What are ‘periods’. State the correlation of a period number with the elements of that period.
Modem periodic table has seven horizontal rows called periods. There is a gradual change in properties with increase in atomic number in the periodic table.

#### Question 4.

Name the elements in correct order of their increasing atomic number present in the first, second and third short periods of the periodic table. State each elements electronic configuration.
(1) Elements of first period

#### Question 5.

Give a reason why
(a) completion of each period is logical
(b) period-2 elements are ‘called bridge elements’.
(a)
Completion of each period is logical since each period begins with Group 1 element having one electron in outermost shell and ends with Group 18 element having filled outermost shell with 8 electrons.
(b)
Li, Be, B, C are called Bridge elements because they show similarties in properties diagonally with the period of the next group.

#### Question 6.

State the property trends in general on moving from left to right in a period of the periodic table.
The property trends in general on moving from left to right in a period of the periodic table are:

1. Number of valence electrons increases by one
2. Metallic character decreases while non-metallic character increases (with the exception of Noble gases).
4. Electron affinity – increases.
5. Electronegativity – increases (with the exception of Noble gases).
6. Ionisation potential – increases.

#### Question 7.

State
[1] the bonding and state of chlorides of period-3 – group 1 [IA], 15[VA], 16 [VIA] and
[2] the bonding and character of oxides of period-3 – group 1 [IA], 13[IIIA] and 16[VLA].
(1)

#### Question 8.

What are ‘groups’ of the Modern Periodic Table ? What does the ‘group number’ signify.
There are 18 vertical columns in the Modem periodic table. These vertical columns are called Groups.It signifies the same electronic configuration and similar properties. .

#### Question 9.

State the type of elements present in
(a) group 1[IA]
(b) group 2 [IIA]
(c) group 3 to 12 [IB to VIIB and VIII]
(d) group 13 to 16 [HIA to VIA]
(e) group 17 [VIIA]
(f) group 18 [0].

(a) Group-1 [IA] Alkali metals
(b) Group-2 [IIA] Alkaline Earth metals
(c) Group-3 to 12 IB to VII B to VIII – Transition elements- metals.
(d) Group 13-16 [III B to VI A] – Post Transition elements.
(e) Group 17 (VII A) Halogens.
(f) Group 18 (0) Noble gases.

#### Question 10.

What are transition elements and inner transition elements. State the position of the inner transition elements. State why noble gases are considered unreactive elements.
Transition elements –
Elements belonging to Group 3 to 12 are called transition elements. Transition elements consists of metals lying between strongly elctropositive metals on a left and least electropositive elements on the right. They all have similar properties.
Inner transition elements: Inner transition elements are the elements belonging to Group 3 in 6th and 7th period.
They form two series i.e. Lanthanide series and Actinide series.
They consists of two Horizontal rows of metals at the bottom of the table.
The gases of zero group (Noble gases) are unreactive because they have a stable electronic configuration.

#### Question 11.

State the characteristics which remain similar and those which show a transition on moving down a sub-group.
Characteristics which remain similar on moving down a group/ sub-group are:

1. Valency of electrons.
2. Chemical properties.

Characteristics which show a transition or moving down a group are:

1. Metallic character increases down the group.
2. Number of electron shells increases down the group.
3. Atomic size increases down the group.
4. Ionisation potential decreases down the group.
5. Electron affinity decreases down the group.

#### Question 12.

Compare the properties of the elements of group 1[IA] i.e. alkali metals and group 17  , halogens.

#### Question 13.

Explain the term (a) periodicity in properties of elements (b) periodic properties (c) periodicity of elements.
(a) Periodicity in properties of elements means occurrence of characteristic properties at definite intervals in the modem periodic table, when elements are arranged in increasing order of their atomic number.

(b) Periodic properties: The properties which appear at regular intervals in the periodic table are called periodic properties.
Periodic Properties are:

• Electron affinity Electro negativity
• Non Metallic and Metallic character.
• Density Melting and boiling points.

(c) Periodicity of elements: Occurrence of elements with similar chemical properties at definite intervals when elements are arranged in increasing order of their atomic numbers is called periodicity of elements.

#### Question 14.

State the reasons for periodicity of elements in periods and groups.
Reasons for Periodicity in properties in periods and groups.

1. After definite intervals of atomic number, similar valence shell electronic configuration occurs.
2. Properties of elements depend upon the number and arrangement of electrons in various shells including valence shells.
3. In the same period, sub-group, increases or decreases, in a particular property is due to gradual change in electronic configuration in the arranged elements.

#### Question 15.

Explain the meaning of the following periodic properties:-
[b] Ionisation potential
[c] Electron affinity
[d] Electronegativity
[e] Non-metallic and metallic character.
(a) Atomic radii: It is distance between the center of the nucleus and outer-most shell of the atom.

(b) Ionisation potential (LP): It is the amount of energy required to remove an electron from the outer most shells of an isolated gaseous atom.

Read Next 👇 Click on Page Number Given Below 👇

$${}$$