Periodic Classification of Elements Test

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Periodic Classification of Elements Test - 22

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Question 1
1 / -0

Name the following with reference to the elements of the modern periodic table.

The alkali metal in period 2

A
H

B
Li

C
Rb

D
Cs

Solution

The group IA elements (Li, Na, K, Rb, Cs and Fr) are called alkali metals and the group II A elements (Be, Mg, Ca, Sr, Ba and Ra) are called alkaline earth metals.
According to this, period 2 alkali metal is Li.
Question 2
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Which has more non-metallic character from the elements $$' X'$$ and $$' Y'$$, with electronic configurations $$2, 8, 5$$ and $$2, 8, 6$$ respectively?

A
$$X$$

B
$$Y$$

C
Both have same non-metallic character

D
None of the above

Solution

As we move from left to right across a period, the non-metallic character increases. Here, $$X$$ has atomic number $$15$$, so, the element is Phosphorous. $$Y$$ has atomic number $$16$$, so, the element is Sulphur. As sulphur is present more to the right of the table, so according to the general trend it is more non-metallic. So, $$Y$$ has more non-metallic character.
Hence, option $$B$$ is correct.
Question 3
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Fill in the blanks with the appropriate words in each case
Element 'B' in period 2 is to the right of element 'A'.
Element 'B' is likely to be ____non-metallic in character than element 'A'

A
more

B
less

C
same

D
none of these

Solution

As we move across a period, metallic character decreases and non metallic character increases.
So, element 'B' is likely to be more non-metallic in character than element 'A'.
Question 4
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The type of elements present in group 18[0] are :

A
alkali metals

B
alkaline earth metals

C
halogens

D
noble gases

Solution

Group 18 elements have complete octet except He and they are inert in nature so this group represents noble gases/inert gases.
Question 5
1 / -0

Atomic weight of which set of elements were corrected by Mendeleev?

A
$$Li, Na, K$$

B
$$U, Be, In$$

C
$$Tc, Sc, Al$$

D
None of the these

Solution

Mendeleev corrected atomic weights of Uranium, Beryllium, and Indium ($$U, Be, In$$) based on their positions in the periodic table. Along with that he also corrected the atomic weights of Gold ($$Au$$) and Platinum ($$Pt$$).
Options $$B$$ is correct.
Question 6
1 / -0

The type of elements present in group 17 [VIIA] are :

A
alkali metals

B
alkaline earth metals

C
noble gases

D
halogens

Solution

Group 17 elements are called halogens, it includes F, Cl, Br, I and At.
Question 7
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The number of valence electrons ___________ across a period and ________ down the group:

A
increases, remains same

B
decreases, remains same

C
remains same, increases

D
increase, decreases

Solution

There are seven periods numbered as 1, 2, 3, 4, 5, 6 and 7.
Each period consists of a series of elements having same valence shell.
Each period corresponds to a number of shells.
Groups :
There are eighteen groups numbered as 1, 2, 3, 4, 5, ........... 13, 14, 15, 16, 17, 18.
Group consists of a series of elements having similar valence shell electronic configuration.
Across a period the valence electrons increases, while down a group they remain same.
Question 8
1 / -0

Which of the following can be classified as Dobereiner's triads?
(a) P, As, Sb
(b) Cu, Ag, Au
(c) S, Se, Te

A
a and b

B
b and c

C
a and c

D
all of the above

Solution

a) $$P (31\ u ), As (74.9\ u), Sb (122\ u)$$ and (d) $$S(32\ u), Se(79\ u), Te(127.6\ u)$$ represent Dobereiners triad.

According to the law of triad proposed by Dobereiners, the atomic weight of a middle element is nearly the same as the average of the atomic weights of the other two elements.

a) $$\displaystyle \frac {31+122}{2} = 76.5 \simeq 74.9 \ u$$

d) $$\displaystyle \frac {32+127.6}{2} =79.8 \simeq 79 \ u $$
Question 9
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In which part of a group would you separately expect the elements to have the greatest metallic character?

A
group 1

B
group 2

C
group 17

D
group 18

Solution

In group 1, we expect the elements to have greatest metallic character because if they donate 1 electron in their valence shell they get octet configuration and stability. Hence, they have huge tendency to donate electrons. Hence, group 1 has greatest metallic character.
Question 10
1 / -0

In the periodic table, the metallic character of element :

A
decreases from left to right across a period and on descending a group

B
decreases from left to right across a period and increases on descending a group

C
increases from left to tight across a period and on descending a group

D
increases from left to right across a period and decreases on descending a group

Solution

In the periodic table, the metallic character of element decreases from left to right across a period and increases on descending a group. The same order is of the atomic radius. Reverse order is true for ionization energy, electron affinity and electronegativity.

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Periodic Classification of Elements Test - 22

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Periodic Classification of Elements Test - 22

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Question 1

H

Li

Rb

Cs

Solution

Question 2

$$X$$

$$Y$$

Both have same non-metallic character

None of the above

Solution

Question 3

more

less

same

none of these

Solution

Question 4

alkali metals

alkaline earth metals

halogens

noble gases

Solution

Question 5

$$Li, Na, K$$

$$U, Be, In$$

$$Tc, Sc, Al$$

None of the these

Solution

Question 6

alkali metals

alkaline earth metals

noble gases

halogens

Solution

Question 7

increases, remains same

decreases, remains same

remains same, increases

increase, decreases

Solution

Question 8

a and b

b and c

a and c

all of the above

Solution

Question 9

group 1

group 2

group 17

group 18

Solution

Question 10

decreases from left to right across a period and on descending a group

decreases from left to right across a period and increases on descending a group

increases from left to tight across a period and on descending a group

increases from left to right across a period and decreases on descending a group

Solution

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