Element O B C N Be Li Atomic radius (pm) 66 88 77 74 111 152 By referring to the modern periodic table find out the periods to which the above elements belong.

The elements like lithium, beryllium, boron, carbon, nitrogen, oxygen belongs to the second period of the modern periodic table.

E M B I B E

Science and Technology Standard Ten Part - 1>Chapter 2 - Periodic Classification of Elements>Can you recall?>Q 1

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IMPORTANT

Earn 100

What are the values of ‘n’ for the shells K, L and M?

Important Questions on Periodic Classification of Elements

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IMPORTANT

Science and Technology Standard Ten Part - 1>Chapter 2 - Periodic Classification of Elements>Can you recall?>Q 2

What is the maximum number of electrons that can be accommodated in a shell? Write the formula

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IMPORTANT

Science and Technology Standard Ten Part - 1>Chapter 2 - Periodic Classification of Elements>Can you recall?>Q 3

Deduce the maximum electron capacity of the shells K, L and M.

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IMPORTANT

Science and Technology Standard Ten Part - 1>Chapter 2 - Periodic Classification of Elements>Think about it>Q 1

What is the relationship between the electronic configuration of an element and its valency?

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10th Maharashtra Board

IMPORTANT

Science and Technology Standard Ten Part - 1>Chapter 2 - Periodic Classification of Elements>Think about it>Q 2

The atomic number of beryllium is

4

while that of oxygen is

8

. Write down the electronic configuration of the two and deduce their valency from the same.

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IMPORTANT

Science and Technology Standard Ten Part - 1>Chapter 2 - Periodic Classification of Elements>Think about it>Q 3

Write the electronic configuration of the first

20

elements, symbol, and write the valency. Make the table on the basis of the modern periodic table.

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IMPORTANT

Science and Technology Standard Ten Part - 1>Chapter 2 - Periodic Classification of Elements>Think about it>Q 4

What is the periodic trend in the variation of valency while going from left to right within a period? Explain your answer with reference to period

2

and period

3

.

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10th Maharashtra Board

IMPORTANT

Science and Technology Standard Ten Part - 1>Chapter 2 - Periodic Classification of Elements>Think about it>Q 5

What is the periodic trend in the variation of valency while going down a group? Explain your answer with reference to the group

1

, group

2

and group

18

.

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IMPORTANT

Science and Technology Standard Ten Part - 1>Chapter 2 - Periodic Classification of Elements>Use your brain power>Q 1

Element	$O$	$B$	$C$	$N$	$Be$	$Li$
Atomic radius (pm)	$66$	$88$	$77$	$74$	$111$	$152$

By referring to the modern periodic table find out the periods to which the above elements belong.

Learn and Prepare for any exam you want !

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