Periodic Classification of Elements Test

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Periodic Classification of Elements Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

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

A
7 groups, 7 periods

B
18 groups, 7 periods

C
8 groups, 7 periods

D
9 groups, 9 periods

Solution

The vertical columnsin a periodic table are called groups and there are 18 groups in the longform of the periodic table.
The horizontal rows ofelements in a periodic table are called periods and there are $7$ periods in the long form of the periodic table.
Hence, the correct option is (B).
Question 2
1 / -0

Which of the following elements of noble gases participate in chemical reaction?

A
He, Ne

B
Kr, Rn

C
He, Kr

D
Rn, He

Solution

Of all the noblegases, these two participate in the chemical reactions as the elements placedat the bottom of the group are very reactive in nature due to their high atomicnumbers.
Hence, the correct option is (B).
Question 3
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How does the valency vary in going down a group?

A
remains the same

B
first increases, then decreases

C
increases

D
decreases

Solution

Since the number ofvalence electrons in a group are the same, all the elements in a group have thesame valency.
Hence, the correct option is (A).
Question 4
1 / -0

How many elements did Mendeleev classify?

A
30.0

B
92.0

C
63.0

D
60.0

Solution

In his periodic table,Mendeleev arranged all the then known $63$ elements in the order of increasingatomic masses.
Hence, the correct option is (C).
Question 5
1 / -0

Nitrogen and phosphorus belong to the group 15 of the periodic table. Which of these will be more electronegative?

A
Phosphorus

B
None of them are electronegative

C
Nitrogen

D
Both are equally electronegative

Solution

On going down in a group of the periodic table, the electronegativecharacter of elements decreases. So, Nitrogen at being the top of group $15$ ofthe periodic table is most electronegative.
Hence, the correct option is (C).
Question 6
1 / -0

Which group elements are called transition metals?

A
Groups 1 and 2

B
Groups 13-17

C
Groups 3-12

D
Group 18

Solution

The d-block elements that are the elements from group $3 - 12$ are called transition elements. This is because their physical and chemical properties are intermediate between $s$ -block and p-block elements properties. Hence, these elements act as a bridge from $s$ -block to $p$ -block and hence they are known as transition elements. In these elements, the outermostshell, as well as the next to the outermost shell are incomplete and in the processof being filled with electrons.
Hence, the correct option is (C).
Question 7
1 / -0

Electropositive character of elements in a period ___________ from left to right.

A
decreases

B
Increases

C
remains the same

D
first increases,then decreases

Solution

As we move from leftto right in a period, the positive charge increases due to a gradual increase inthe number of protons. So, the valence electrons are pulled in more strongly bythe nucleus and it becomes more and more difficult for the atoms to loseelectrons. Thus, on moving from left to right in a period, the tendency ofatoms to lose electrons decreases i.e electropositive character of elementsdecreases.
Hence, the correct option is (A).
Question 8
1 / -0

In Newland's law of octaves, elements are arranged in order of:

A
decreasing atomic number

B
decreasing atomic masses

C
increasing atomic masses

D
increasing atomic number

Solution

According to Newland's law of octaves, when elements are arranged in the order of increasing atomicmasses, the properties of the eighth element are a repetition of the propertiesof the first element.
Hence, the correct option is (C).
Question 9
1 / -0

Which group of periodic table does Ge belongs to ?

A
Group 10

B
Group 14

C
Group 13

D
Group 4

Solution

The carbon group is a periodic table group consisting ofcarbon (C), silicon (Si), germanium (Ge), tin (Sn), lead(Pb), and flerovium(Fl). In modern IUPAC notation, it is called Group $14$ .
Hence, the correct option is (B).
Question 10
1 / -0

How many elements are placed in lanthanide and actinide series?

A
14, 16

B
15,16

C
14, 14

D
15,15

Solution

The elements with atomic number 58 to 71 are called lanthanoid series and the elements with atomic numbers 90 to 103 are called actinoid series.
Hence, the correct option is (C).
Question 11
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In the modern periodic table which are the metals among the first 10 elements?

A
Li, Be

B
Be, C

C
B, Be

D
Li, B

Solution

Being the elements ofPeriod $2$ , both of them possess a high metallic character.
Hence, the correct option is (A).
Question 12
1 / -0

An element P belongs to the second period and group 13. What is the formula of its oxide?

A
PO

B
P₂O₃

C
P₂O

D
P₂O₅

Solution

The valency of the elements of group $13$ is $3, (13 - 10 = 3)$ .
And oxygen has thevalency of $2$ . So, formula of the oxide will be $P_{2} O_{3}$ .
Hence, the correct option is (B).
Question 13
1 / -0

What property of all elements in the column $17^{t h}$ of the periodic table as fluorine have in common?

A
All have valency 1

B
All are electronegative elements and have valency 1

C
All are electropositive

D
All are electronegative elements

Solution

All the elements of a group have the same number of valence electrons i.e., Fluorine belongs to a group $17$ and all the elements have $7$ valence electrons.
To complete theiroctet, they accept one electron readily and therefore they are electronegativeelements with valency $1$ .
Hence, the correct option is (B).
Question 14
1 / -0

Which elements are called as synthetic elements?

A
beyond atomic number 89

B
beyond atomic number 92

C
beyond atomic number 90

D
beyond atomic number 56

Solution

All the elementsbeyond atomic no $92$ are prepared in the laboratory and so are called as Syntheticelements.
Hence, the correct option is (B).
Question 15
1 / -0

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

A
metalloid

B
metallic

C
anomalous nature

D
non metallic

Solution

The element withatomic number $20$ is Calcium(Ca) and it has metallic character as it loses ittwo valence electrons easily to complete its octet.
Hence, the correct option is (B).

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Periodic Classification of Elements Test - 13

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Question 1

7 groups, 7 periods

18 groups, 7 periods

8 groups, 7 periods

9 groups, 9 periods

Solution

Question 2

He, Ne

Kr, Rn

He, Kr

Rn, He

Solution

Question 3

remains the same

first increases, then decreases

increases

decreases

Solution

Question 4

30.0

92.0

63.0

60.0

Solution

Question 5

Phosphorus

None of them are electronegative

Nitrogen

Both are equally electronegative

Solution

Question 6

Groups 1 and 2

Groups 13-17

Groups 3-12

Group 18

Solution

Question 7

decreases

Increases

remains the same

first increases,then decreases

Solution

Question 8

decreasing atomic number

decreasing atomic masses

increasing atomic masses

increasing atomic number

Solution

Question 9

Group 10

Group 14

Group 13

Group 4

Solution

Question 10

14, 16

15,16

14, 14

15,15

Solution

Question 11

Li, Be

Be, C

B, Be

Li, B

Solution

Question 12

PO

P2O3

P2O

P2O5

Solution

P₂O₃

P₂O

P₂O₅