You have understood certain periodic trends in the periodic table?.Based on these tick the correct answer in the table given below. Trends Down the group Across the period Size of atom decreases/increases decreases/increases Metallic character decreases/increases decreases/increases Non-metallic character decreases/increases decreases/increases Ionisation energy decreases/increases decreases/increases Electronegativity decreases/increases decreases/increases

a. Size of atom: It increases down the group because the number of shells increases down the group. They remain the same across the period and nuclear charge increases. Hence, the size of the atom decreases across the period b. Metallic character: It increases down the group because the force of attraction between the nucleus and outermost election decreases due to the addition of shells. Across the period metallic character decreases because of an increase in nuclear charge. c. Non-metallic character: It decreases down the group because of less force of attraction between the nucleus and outermost electron. It increases across the period because of increasing nuclear charge. Hence, the electrons tightly bound to the atom. d. Ionisation energy: It decreases down the group as less force of attraction between the nucleus and outermost electron because of the addition of more shells. It increases across the period because of increasing nuclear charge. Hence, the electrons tightly bound to the atom. So more energy is required to remove the electron. Size of atom Down the group Across the period Size of atom increases decreases Metallic character increases decreases Non-metallic character decreases increases Ionisation energy decreases increases Electronegativity decreases increases e. Electronegativity: It decreases down the group because of less force of attraction between the nucleus and outermost electron because of the addition of more shells. So an atom can not attract electrons strongly. It increases across the period because of increase in the nuclear charge. Valence shells are more than half-filled towards the right side of the periodic table, so these atoms try to gain electrons. So electronegativity increases.

E M B I B E

Chemistry Standard IX Part 1>Chapter 4 - Periodic Table>Exercise 1

Kerala Board Solutions for Chapter: Periodic Table, Exercise 1: Exercise 1

Author:Kerala Board

Kerala Board Chemistry Solutions for Exercise - Kerala Board Solutions for Chapter: Periodic Table, Exercise 1: Exercise 1

Attempt the free practice questions on Chapter 4: Periodic Table, Exercise 1: Exercise 1 with hints and solutions to strengthen your understanding. Chemistry Standard IX Part 1 solutions are prepared by Experienced Embibe Experts.

Questions from Kerala Board Solutions for Chapter: Periodic Table, Exercise 1: Exercise 1 with Hints & Solutions

MEDIUM

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 1>Chapter 4 - Periodic Table>Exercise 1

How does electronegativity vary from top to bottom in a group?

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9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 1>Chapter 4 - Periodic Table>Exercise 1

What happens to the electronegativity when we move across a period?

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9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 1>Chapter 4 - Periodic Table>Exercise 1

Where will be the position of the elements with high electronegativity in the periodic table?

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9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 1>Chapter 4 - Periodic Table>Exercise 1

Where will be the position of the elements with low electronegativity in the periodic table?

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9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 1>Chapter 4 - Periodic Table>Exercise 1

What is the relationship between electronegativity and the size of an atom?

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9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 1>Chapter 4 - Periodic Table>Exercise 1

Is there any relationship between electronegativity and metallic and non-metallic characters? Explain.

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9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 1>Chapter 4 - Periodic Table>Exercise 1

Is a highly electronegative element a metal or a non-metal. Then, what about those having low electronegativity? Find out?

MEDIUM

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 1>Chapter 4 - Periodic Table>Exercise 1

You have understood certain periodic trends in the periodic table?.Based on these tick the correct answer in the table given below.

Trends	Down the group	Across the period
Size of atom	decreases/increases	decreases/increases
Metallic character	decreases/increases	decreases/increases
Non-metallic character	decreases/increases	decreases/increases
Ionisation energy	decreases/increases	decreases/increases
Electronegativity	decreases/increases	decreases/increases

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