Look at the table and tell: Second period Li Be B C N O F Atomic number 3 4 5 6 7 8 9 Which elements will form negative ions and which will form positive ions?

Atoms which have the tendency to lose electrons forms the positive ions. These ions are called cations. Electronic configuration of Li 3 = 2 , 1 Electronic configuration of Be 4 = 2 , 2 Electronic configuration of B 5 = 2 , 3 These elements have 1 , 2 , 3 electrons in their valence shell. These atoms can easily lose these valence electrons on little energy and forms positive ions Li + , Be + + , B + + + respectively. Atoms which have the tendency to gain electrons forms the negative ions. These ions are called anions. Electronic configuration of C 6 = 2 , 4 Electronic configuration of N 7 = 2 , 5 Electronic configuration of O 8 = 2 , 6 Electronic configuration of F 9 = 2 , 7 Carbon has four electrons in its valence shell which requires huge energy to lose or gain electrons. It generally shares its electrons. N , O and F have 5 , 6 , 7 electrons in their valence shell. These atoms can easily gain 3 , 2 , 1 electrons respectively to complete their octet and forms negative ions N - - - , O - - , F - respectively.

Look at the table and tell: Second period Li Be B C N O F Atomic number 3 4 5 6 7 8 9 On which side of the Periodic Table do you find the metals and on which side do you find the non-metals?

Metals have the tendency to lose electrons and form cations whereas non-metals have the tendency to gain electrons and form anions. Since elements like Li , Be have the tendency to lose electrons hence these are metals and placed on the left side of the periodic table. Whereas elements like N , O , F have the tendency to gain electrons hence these are non-metals and are placed on the right side of the periodic table.

Look at the table and tell: Second period Li Be B C N O F Atomic number 3 4 5 6 7 8 9 How do the metallic and non-metallic properties change as we move from left to right?

Metallic properties decreases and non-metallic properties increases as we move from left to right in periods. If we talk about metals, Beryllium is less metallic than Lithium. If we talk about non-metals Oxygen has less non-metallic property than Fluorine.

E M B I B E

Science (Theory & Practical) Class-10>Chapter 4 - Periodic Classification of Elements>Questions

Chhattisgarh Board Solutions for Chapter: Periodic Classification of Elements, Exercise 1: Questions

Author:Chhattisgarh Board

Chhattisgarh Board Science Solutions for Exercise - Chhattisgarh Board Solutions for Chapter: Periodic Classification of Elements, Exercise 1: Questions

Attempt the practice questions on Chapter 4: Periodic Classification of Elements, Exercise 1: Questions with hints and solutions to strengthen your understanding. Science (Theory & Practical) Class-10 solutions are prepared by Experienced Embibe Experts.

Questions from Chhattisgarh Board Solutions for Chapter: Periodic Classification of Elements, Exercise 1: Questions with Hints & Solutions

EASY

10th Chhattisgarh Board

IMPORTANT

Science (Theory & Practical) Class-10>Chapter 4 - Periodic Classification of Elements>Exercise>Q 2

Look at the table and tell:

Second period	$Li$	$Be$	$B$	$C$	$N$	$O$	$N^{- - -}, O^{- -}, F^{-}$
Atomic number	$3$	$4$	$5$	$6$	$7$	$8$	$9$

Which elements will form negative ions and which will form positive ions?

EASY

10th Chhattisgarh Board

IMPORTANT

Science (Theory & Practical) Class-10>Chapter 4 - Periodic Classification of Elements>Exercise>Q 3

Look at the table and tell:

Second period	$Li$	$Be$	$B$	$C$	$N$	$O$	$F$
Atomic number	$3$	$4$	$5$	$6$	$7$	$8$	$9$

On which side of the Periodic Table do you find the metals and on which side do you find the non-metals?

EASY

10th Chhattisgarh Board

IMPORTANT

Science (Theory & Practical) Class-10>Chapter 4 - Periodic Classification of Elements>Exercise>Q 4

Look at the table and tell:

Second period	$Li$	$Be$	$B$	$C$	$N$	$O$	$F$
Atomic number	$3$	$4$	$5$	$6$	$7$	$8$	$9$

How do the metallic and non-metallic properties change as we move from left to right?

EASY

10th Chhattisgarh Board

IMPORTANT

Science (Theory & Practical) Class-10>Chapter 4 - Periodic Classification of Elements>Exercise>Q 5

On observing the periodic table we find that there is an increase in metallic character and decrease in non-metallic properties as we move down a group. Do these properties also change in a period?

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10th Chhattisgarh Board

IMPORTANT

Science (Theory & Practical) Class-10>Chapter 4 - Periodic Classification of Elements>Questions>Q 1

How does the ionization energy change in a group?

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10th Chhattisgarh Board

IMPORTANT

Science (Theory & Practical) Class-10>Chapter 4 - Periodic Classification of Elements>Questions>Q 2

How does the ionization energy of elements belonging to the same period vary? Explain why?

EASY

10th Chhattisgarh Board