Periodic Classification of Elements Test

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Periodic Classification of Elements Test - 16

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Weekly Quiz Competition

Question 1
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The group in which all the elements do not have same number electrons in their valence shell is :

A
zero

B
second

C
first

D
seventh

Solution

In the zeroth group all the elements do not have same number electrons in their valence shell. Zero group elements are inert elements. Helium has 2 electrons and the rest of the group has 8 elements.
Question 2
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Non-metallic character ________ down the group.

A
increases

B
decreases

C
constant

D
none of these

Solution

As we move down the group, size increases and also tendency to loose electron increases, non metallic character decreases and metallic character increases.
Question 3
1 / -0

Which of the following triads does not follow Dobereiner's law of triads?

A
Li, Na, K

B
Ca, Sr, Ba

C
Be, Mg, Ca

D
Cu, Ag, Au

Solution

Since the atomic weight of Ag is not equal to the mean of the atomic weights of Cu and Au.

Thus, (Cu, Ag, Au) triad do not follow Dobereiner's law of triads.

Option D is correct.
Question 4
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The early attempt to classify elements as metals and non-metals was made by :

A
Mendeleev

B
Newlands

C
Lavoisier

D
Henry Moseley

Solution

The earliest attempt to classify the elements was in 1789, when Antoine Lavoisier grouped the elements based on their properties into gases, non-metals and metals.
Question 5
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In Newlands classification, elements are arranged in an increasing order of their:

A
mass number

B
atomic number

C
atomic weight

D
all of these

Solution

Newlands arranged elements in increasing order of their atomic weight and stated that every eighth element resembled properties of the first element..

Hence, the correct option is C.
Question 6
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What happens to the number of valence electrons in atoms of elements as we go down a group in the periodic table?

A
Increases

B
Decreases

C
Same

D
None of these

Solution

As we move from top to bottom in a group, the number of valence electrons remains same because a group is defined such that their valence shell configuration is same. Hence, valence electrons remain same but valence shell changes.
Question 7
1 / -0

Elements in a period have same :

A
number of valence electrons

B
valency

C
number of shells

D
volume

Solution

Elements present in horizontal rows are called periods. Elements belonging to the same period have same no. of the shell as the electrons are added in the same shell of the element.
Question 8
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What were the limitations of Newlands' classification?

A
It was applicable only for lighter elements

B
He adjusted two elements on the same place

C
The pattern was only observed up to calcium

D
All of the above
Solution
The limitations of Newlands' classification were:
- It was only applicable for lighter elements.
- He adjusted two elements in one place.
- The pattern was only observed up to calcium.
Question 9
1 / -0

Modern periodic law was proposed by :

A
Dmitri Mendeleev

B
Henry Moseley

C
J.A.R. Newlands

D
Niels Bohr

Solution

Modern periodic law was proposed by Henry Moseley in 1913. According to the modern periodic law, the properties of the elements and their compounds are a periodic function of their atomic numbers.
Question 10
1 / -0

The placement of elements in the Newlands' table was compared to:

A
weeks of a month

B
notes of music

C
months of a year

D
days of a month

Solution

The placement of elements in the Newlands' periodic table was compared to the notes of music where the first note and the eighth note are the same. Similarly, in Newlands' periodic table, the properties repeat after each interval of $$7$$ elements.

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Periodic Classification of Elements Test - 16

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Question 1

zero

second

first

seventh

Solution

Question 2

increases

decreases

constant

none of these

Solution

Question 3

Li, Na, K

Ca, Sr, Ba

Be, Mg, Ca

Cu, Ag, Au

Solution

Question 4

Mendeleev

Newlands

Lavoisier

Henry Moseley

Solution

Question 5

mass number

atomic number

atomic weight

all of these

Solution

Question 6

Increases

Decreases

Same

None of these

Solution

Question 7

number of valence electrons

valency

number of shells

volume

Solution

Question 8

It was applicable only for lighter elements

He adjusted two elements on the same place

The pattern was only observed up to calcium

All of the above

Solution

Question 9

Dmitri Mendeleev

Henry Moseley

J.A.R. Newlands

Niels Bohr

Solution

Question 10

weeks of a month

notes of music

months of a year

days of a month

Solution

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