Periodic Classification of Elements Test

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Periodic Classification of Elements Test - 1

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Question 1
1 / -0

How many groups and periods are present in the modern periodic table?

A
7 groups, 7 periods

B
9 groups, 9 periods

C
8 groups, 7 periods

D
18 groups, 7 periods

Solution

Explanation:

The vertical columns in a periodic table are called groups and there are 18 groups in the long form of periodic table.

The horizontal rows of elements in a periodic table are called periods and there are 7 periods in the long form of periodic table.
Question 2
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Electropositive character of elements in a period ___________ from left to right.

A
remains the same

B
Increases

C
first increases,then decreases

D
decreases

Solution

Explanation:

As we move from left to right in a period, the positive charge increases due to gradual increase in the number of protons. So, the valence electrons are pulled in more strongly by the nucleus and it becomes more and more difficult for the atoms to lose electrons. Thus, on moving from left to right in a period, the tendency of atoms to lose electrons decreases i.e electropositive character of elements decreases.
Question 3
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How does the valency vary in going down a group?

A
decreases

B
remains the same

C
first increases, then decreases

D
increases

Solution

Explanation:

Since the number of vallence electrons in a group is the same, all the elements in a group have the same valency.
Question 4
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An element P belongs to the second period and group 13. What is the formula of its oxide?

A
P₂O

B
P₂O₅

C
PO

D
P₂O₃

Solution

Explanation:

The valency of the element of group 13 is 3, (13-10=3)

and oxygen has the valency of 2. So, formula of the oxide will be P₂O₃.
Question 5
1 / -0

What is the nature of an element having atomic number 20?

A
metalloid

B
anomalous nature

C
metallic

D
non metallic

Solution

Explanation:

The element with atomic number 20 is Calcium(Ca) and it has metallic character as it loses it two valence electrons easily to complete its octet.
Question 6
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Which group elements are called transition metals?

A
Groups 13-17

B
Groups 1 and 2

C
Groups 3-12

D
Group 18

Solution

Explanation:

The group 3 to group 12 elements are called Transition elements. In these elements, the outermost shell as well as the next to outermost shell are incomplete and in the process of being filled with electrons.
Question 7
1 / -0

What property of all elements in the column of the periodic table as fluorine have in common?

A
All are electronegative elements

B
All are electropositive

C
All have valency 1

D
All are electronegative elements and have valency 1

Solution

Explanation:

All the elements of a group have the same number of valence electrons i.e Fluorine belongs to group 17 and all the elements have 7 valence electrons.

To complete their octet, they accept one electron readily and therefore they are electronegative elements with valency 1.
Question 8
1 / -0

Which group of periodic table does Ge belongs to ?

A
Group 14

B
Group 13

C
Group 10

D
Group 4
Question 9
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Which elements are called as synthetic elements?

A
beyond atomic number 89

B
beyond atomic number 56

C
beyond atomic number 92

D
beyond atomic number 90

Solution

Explanation:

All the elements beyond atomic no 92 are prepared in laboratory and so are called as Synthetic elements.
Question 10
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In Newlands law of octaves elements are arranged in order of

A
decreasing atomic masses

B
increasing atomic masses

C
increasing atomic number

D
decreasing atomic number

Solution

Explanation:

According to Newlands' law of octaves, when elements are arranged in the order of increasing atomic masses, the properties of the eighth element are a repetition of the properties of the first element.

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Periodic Classification of Elements Test - 1

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Question 1

7 groups, 7 periods

9 groups, 9 periods

8 groups, 7 periods

18 groups, 7 periods

Solution

Question 2

remains the same

Increases

first increases,then decreases

decreases

Solution

Question 3

decreases

remains the same

first increases, then decreases

increases

Solution

Question 4

P2O

P2O5

PO

P2O3

Solution

Question 5

metalloid

anomalous nature

metallic

non metallic

Solution

Question 6

Groups 13-17

Groups 1 and 2

Groups 3-12

Group 18

Solution

Question 7

All are electronegative elements

All are electropositive

All have valency 1

All are electronegative elements and have valency 1

Solution

Question 8

Group 14

Group 13

Group 10

Group 4

Question 9

beyond atomic number 89

beyond atomic number 56

beyond atomic number 92

beyond atomic number 90

Solution

Question 10

decreasing atomic masses

increasing atomic masses

increasing atomic number

decreasing atomic number

Solution

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P₂O

P₂O₅

P₂O₃