Viraf J. Dalal solutions for Simplified ICSE Chemistry [English] Class 9 chapter 5 - The Periodic Table [Latest edition]

The similarities in the properties of a group of elements are because they have the same ______.

What is meant by a Group in the Periodic Table?

State the number of elements in Period 2 of the Periodic Table.

State the number of elements in Period 1 of the Periodic Table.

State the number of elements in Period 2 of the Periodic Table.

State the number of elements in Period 3 of the Periodic Table.

Name the elements in Period 1.

What is the common feature of the electronic configuration of the elements at the end of Period 2 and Period 3?

If an element is in Group 17 [or Group 7A] is it likely to be metallic or non- metallic in character?

Supply the missing word from those in bracket:

If an element has one electron in its outermost energy level [shell] then it is likely to be _______.

What are the elements.

Give a reason why elements need to be properly classified.

How did the early chemists classify elements?

Why was this basis of classification discarded for future classification of elements?

What was Dobereiner’s basis, of classification of elements?

State Dobereiner’s Law of Triads with suitable examples.

Explain why Dobereiner’s method of classification of elements did not hold much weightage for future classification.

What was the basis of the classification proposed by Newland?

State Newland’s Law of Octaves with a suitable example.

In which way was Newland’s Law of Octaves comparable to a musical note.

How did Mendeleev arrange the elements in the periodic table?

What was the basis of Mendeleev's classification?

State Mendeleev's periodic law.

How did Mendeleev's arrangement of elements correlate with the periodicity of the properties of elements?

State the contributions made by Mendeleev towards the periodic table.

What were the defects and anomalies in Mendeleeff's Periodic Table and how are they resolved by Moseley? 

How were elements arranged in the long form of the periodic table or the Modern Periodic Table?

State the modern periodic law.

Compare Modern Periodic Law with Mendeleev's Periodic Law.

What are the periods in a periodic table?

What is meant by ‘period number’. What does it signify?

Name the period which is the shortest period of the periodic table.

State the number of elements in Period 1 of the Periodic Table.

State the number of elements in Period 2 of the Periodic Table.

State the number of elements in Period 3 of the Periodic Table.

Name the elements in the correct order of their increasing atomic numbers present in the first, second, and third short periods of the periodic table.
State which of the elements are –

1. metallic 
2. non-metallic 
3. noble gases

in each of the periods 2 and 3.

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

What is meant by a Group in the Periodic Table?

State the property trends in general of elements on moving down in a group of the periodic table.

State the characteristics which remain similar in moving down in a group of the periodic table.

Write a short note on the following type of element –

alkali metals

Write a short note on the following type of element –

alkaline earth metals

Write a short note on the following type of element –

halogens

Write a short note on the following type of element –

noble gases

Write a short note on the following type of element –

transition elements

Write a short note on the following type of element –

inner transition elements

Write a short note on the following type of element –

normal elements

‘The periodic table contains elements methodically grouped together’.

State the main helpful features of the long form of the periodic table.

Name and state the following with reference to the elements of the first three periods of the periodic table.

Noble gas with duplet arrangement of electrons.

Name or state following with reference to the element of the first three periods of the periodic table.

The noble gas having an electronic configuration 2, 8, 8.

Name or state following with reference to the elements of the first three periods of the periodic table.

A metalloid in period 2 and in period 3.

Name or state following with reference to the elements of the first three periods of the periodic table.

The number of electron shells in elements of period 1, period 2, and period 3.

Name or state following with reference to the element of the first three periods of the periodic table.

The valency of elements in group 1 [I–A].

Name and state the following with reference to the elements of the first three periods of the periodic table.

Group whose elements have zero valencies.

Name or state following with reference to the element of the first three periods of the periodic table.

An alkaline earth metal in period 3.

Name or state following with reference to the element of the first three periods of the periodic table.

The non-metallic element present in period 3 other than sulphur and chlorine.

Name or state following with reference to the element of the first three periods of the periodic table.

A non-metal in period 2 having electronic configuration 2, 6.

Name and state the following with reference to the elements of the first three periods of the periodic table.

An electrovalent compound formed by an alkaline earth metal and a halogen.

Name or state following with reference to the element of the first three periods of the periodic table.

A covalent compound formed between an element in period 1 and a halogen.

Name and state the following with reference to the elements of the first three periods of the periodic table.

Alkali metal in period 3 dissolves in the water giving a strong alkali.

Name or state following with reference to the element of the first three periods of the periodic table.

A metal in period 3 having valency 3.

Name and state the following with reference to the elements of the first three periods of the periodic table.

Bridge elements of Period 3 of Group 1,2 and 3.

Name or state following with reference to the element of the first three periods of the periodic table.

The periods which contain the inner transition elements.

Name or state following with reference to the element of the first three periods of the periodic table.

The formula of the hydroxide of the element having electronic configuration 2, 8, 2.

Name or state following with reference to the element of the first three periods of the periodic table.

The valency of the element in period 3 having atomic number 17.

Name or state following with reference to the element of the first three periods of the periodic table.

A non-metal in period 2 which is tetravalent.

Select the correct answer from the options given below.

He arranged elements in increasing order of atomic numbers.

Select the correct answer from the options given below.

It is a metal in period 2 having electronic configuration 2, 1?

Select the correct answer from the options given below.

It is a period having elements from atomic no. 11 to 18.

Select the correct answer from the options given below.

The most reactive halogen from group 17.

Select the correct answer from the options given below.

Is the group number of the element whose atomic number is 4.

Fill in the blanks from the words A to F given below’.

A: Decreases
B: Increases
C: Remains same
D: Increases by one
E: Electropositive
F: Electronegative

Across a period from left to right in the Modern Periodic Table.
No. of electron shells _________; No. of valence electrons __________: Electronegativity increases Character of elements changes from electropositive to ________.

Fill in the blanks from the words A to F given below.

A: Decreases
B: Increases
C: Remains same
D: Increases by one
E: Electropositive
F: Electronegative

Down a group in the Modern Periodic Table.
No. of electron shells __________; No. of valence electrons ________; Electronegativity ________ Character of elements changes from _________ to ____________.

Give a reason for the following:

Mendeleev's contributions to the periodic table laid the foundation for the Modern Periodic Table.

Give a reason for the following:

Properties of elements are periodic functions of their atomic numbers and not atomic weights.

Give a reason for the following:

A transition from metallic to non-metallic elements is seen on moving from left to right in a period of the periodic table.

Give a reason for the following:

Noble gases do not form compounds readily.

Give a reason for the following:

Group 1 [I – A] elements are called alkali metals.

State the following:

The group to which the element with an electronic configuration of 2, 8, 2 belongs.

State the following:

The group from the groups 1 [IA], 2 [IIA], 16 [VIA] and 7 [VIIA] whose elements are most electronegative.

State the following:

The group which contains highly electropositive metals including sodium.

State the following:

The group whose elements are unreactive or inert.

State the following:

The group which contains highly reactive electronegative non-metals including chlorine.

Match the elements of List – I with their type from List – II.

Complete the table pertaining to the following elements given in Column I.