Classification of Elements and Periodicity in Properties Test

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Classification of Elements and Periodicity in Properties Test - 1

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Weekly Quiz Competition

Question 1
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The successive ionisation energy values for an element 'X' are given below:

(i) 1^st ionisation energy = 410 kJ mol^-1
(ii) 2^nd ionisation energy = 820 kJ mol^-1
(iii) 3^rd ionisation energy = 1100 kJ mol^-1
(iv) 4^th ionisation energy = 1500 kJ mol^-1
(v) 5^th ionisation energy = 3200 kJ mol^-1

Find out the number of valence electrons for an atom of 'X'.

A
4

B
3

C
5

D
2
Question 2
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Correct option to complete the following statement is :
"Mendeleeve's classification of element is based upon similarites in properties of different elements with increasing order of their atomic weights .
In cases where dissimarites in properties of an element appeared he placed the elements with similar ......... together".

A
properties

B
atomic number

C
atomic weight

D
molecular weights

Solution

Mendeleev believed that the properties of elements are function of their atomic weights. He arranged elements in increasing order of their atomic weight but gave priority to the properties over weight. Wherever a dissimilarity in properties of element occured during arranging them in ascending order of their atomic weights, he ignored the atomic weight of the element but kept the elements with similar properties together.
Thus , he laid more stress over the similarities in properties of different elements rather than their atomic weights.
Question 3
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In the modern periodic table

A
The horizontal rows are called periods and the vertical columns, groups.

B
The horizontal rows are called periods and the vertical columns, series.

C
The horizontal rows are called series and the vertical columns, groups.

D
The horizontal rows are called groups and the vertical columns, periods

Solution

In modern periodic table, the elements are arranged in the increasing order of their atomic number. It contains 7 horizontal rows called periods and 18 vertical columns called groups.
Question 4
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The existence of which of the following became the reason for the failure of Mendeleev's periodic law?

A
Alkali metals

B
Alkaline earth metals

C
Halogens

D
Isotopes
Question 5
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Mendeleev 'Periodic Law' states that

A
The properties of the elements are the periodic function of their atomic weights.

B
The properties of the elements are a periodic function of the number of electrons.

C
The properties of the elements are a periodic function of their atomic number.

D
The properties of the elements are a periodic function of the number of neutrons.

Solution

If the elements are arranged in the order of their increasing atomic weights, after a regular interval similiar properties of elements are repeated.
Question 6
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Choose one of the following in the order of increasing radii:

A
I- > I > I+

B
I+ < I- < I

C
I- < I+ < I

D
I < I⁺ < I^-

Solution

Size of anion is greater than the size of parent atom and size of cation. As the –ve charge of anion increases ionic radii increases due to decrease in the effective nuclear charge and vice versa.
Question 7
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Which of the following statements is correct?

A
X^– ion is larger in size than X atom.

B
X⁺ ion is larger in size than X atom.

C
X⁺ ion is larger in size than X^– ion.

D
X⁺ and X^– ions are equal in size.
Question 8
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Dmitri Mendeleev (1834-1907) and the German chemist, Lothar Meyer (1830-1895) proposed arranging elements in

A
increasing order of their atomic numbers

B
decreasing order of their atomic numbers

C
decreasing order of their atomic weights

D
increasing order of their atomic weights

Solution

If the elements are arranged in the order of their increasing atomic weights, after a regular interval similiar properties of elements are repeated.
Question 9
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The elements of the same group of the periodic table have the same

A
number of protons

B
number of valence shells

C
number of valence electrons

D
electron affinity
Question 10
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Mendeleev arranged the elements on the basis of their

A
increasing atomic numbers

B
increasing atomic masses

C
decreasing atomic numbers

D
decreasing atomic masses

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Classification of Elements and Periodicity in Properties Test - 1

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Classification of Elements and Periodicity in Properties Test - 1

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Question 1

4

3

5

2

Question 2

properties

atomic number

atomic weight

molecular weights

Solution

Question 3

The horizontal rows are called periods and the vertical columns, groups.

The horizontal rows are called periods and the vertical columns, series.

The horizontal rows are called series and the vertical columns, groups.

The horizontal rows are called groups and the vertical columns, periods

Solution

Question 4

Alkali metals

Alkaline earth metals

Halogens

Isotopes

Question 5

The properties of the elements are the periodic function of their atomic weights.

The properties of the elements are a periodic function of the number of electrons.

The properties of the elements are a periodic function of their atomic number.

The properties of the elements are a periodic function of the number of neutrons.

Solution

Question 6

I- > I > I+

I+ < I- < I

I- < I+ < I

I < I+ < I-

Solution

Question 7

X– ion is larger in size than X atom.

X+ ion is larger in size than X atom.

X+ ion is larger in size than X– ion.

X+ and X– ions are equal in size.

Question 8

increasing order of their atomic numbers

decreasing order of their atomic numbers

decreasing order of their atomic weights

increasing order of their atomic weights

Solution

Question 9

number of protons

number of valence shells

number of valence electrons

electron affinity

Question 10

increasing atomic numbers

increasing atomic masses

decreasing atomic numbers

decreasing atomic masses

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I < I⁺ < I^-

X^– ion is larger in size than X atom.

X⁺ ion is larger in size than X atom.

X⁺ ion is larger in size than X^– ion.

X⁺ and X^– ions are equal in size.