Science for Class 10>Chapter 1 - Periodic Classification of Elements>Let us answer these>Q 11

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10th Manipur Board

IMPORTANT

Earn 100

Why are non-metals found on the right-hand side of the periodic table towards the top?

Important Questions on Periodic Classification of Elements

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IMPORTANT

Science for Class 10>Chapter 1 - Periodic Classification of Elements>EXERCISES>Q 1

Why is there a need to classify the elements? What difficulties are likely to arise if the classification is not made?

EASY

10th Manipur Board

IMPORTANT

Science for Class 10>Chapter 1 - Periodic Classification of Elements>EXERCISES>Q 2

Name the period and group to which the element with atomic number

15

belongs.

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IMPORTANT

Science for Class 10>Chapter 1 - Periodic Classification of Elements>EXERCISES>Q 3

State one reason for keeping boron and aluminium in the same group of the periodic table.

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10th Manipur Board

IMPORTANT

Science for Class 10>Chapter 1 - Periodic Classification of Elements>EXERCISES>Q 4

Write the electronic configurations of the elements

Na, Al, Ca, O

and

Si

and justify their positions in the periodic table.

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IMPORTANT

Science for Class 10>Chapter 1 - Periodic Classification of Elements>EXERCISES>Q 5

Why is atomic number more important than atomic mass to know the properties of the elements?

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IMPORTANT

Science for Class 10>Chapter 1 - Periodic Classification of Elements>EXERCISES>Q 6

State how atomic size varies from left to right in a period and from top to bottom in a group.

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IMPORTANT

Science for Class 10>Chapter 1 - Periodic Classification of Elements>EXERCISES>Q 7

The atomic radii of the elements of second period are given below:

$2 nd$ period elements	$B$	$Be$	$O$	$N$	$Li$	$C$
Atomic radii (pm)	$80$	$90$	$74$	$75$	$123$	$77$

(a) Arrange the elements in the decreasing order of their atomic radii, keeping the element with the largest atomic radius first.
(b) Find out whether the arrangement is in the pattern of a period or not?
(c) From this data, infer how the atomic size of the elements changed as one goes from left to right in a period.

EASY

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IMPORTANT

Science for Class 10>Chapter 1 - Periodic Classification of Elements>EXERCISES>Q 8

By considering their position in the periodic table, which one of the following elements would you expect to have the maximum metallic character?

$Ga, Ge, As, Se, Br$