Classification of Elements and Periodicity in Properties Test

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Classification of Elements and Periodicity in Properties Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

How many periods are there in the long form of the periodic table?

A
6

B
7

C
8

D
9

Solution

There are seven horizontal rows in the periodic table corresponding to seven periods.
Question 2
1 / -0

The short periods and the long periods are________

A
Short periods - 1 and 2 and Long periods - 4 and 5

B
Short periods - 2 and 3 and Long periods - 5 and 6

C
Short periods - 2 and 3 and Long periods - 4 and 5

D
Short periods - 3 and 4 and Long periods - 6 and 7

Solution

Periods 2 and 3 are called short periods because we could find elements with s and p orbitals hence only 8 electrons fit in that where as in case of periods 4 and 5 it has even d orbitals hence more 10 electrons would be there in these periods compared to 2 and 3.

Hence Short periods -2 and 3 with 8 elements each.

Long periods - 4 and 5 with 18 elements each.

Option C is correct.
Question 3
1 / -0

In periodic table, metallic elements appear :

A
in the left-hand columns

B
in the top rows

C
in the right-hand columns

D
in the bottom rows

Solution

Alkali and alkaline earth elements are metal and they belongs to I and II group so they are in the left-hand columns of table.
Question 4
1 / -0

What is the electronic configuration of lithium [ Atomic no. = 3, Mass no. = 7]?

A
$$2$$

B
$$2, 3$$

C
$$2, 2$$

D
$$2, 1$$
Question 5
1 / -0

In long form, shortest period is____________.

A
first

B
second

C
third

D
zero

Solution

In the long form of periodic table, the first period has $$2$$ elements, second and third have $$8$$ elements; fourth and fifth have $$18$$ elements and sixth period has $$32$$ elements with seventh period being incomplete. Thus the shortest among these is first period. Hence correct answer is first period.
Question 6
1 / -0

The electron configuration of $$_{11}Na^{23}$$ is

A
$$1s^{2},2s^{2},2p^{5},3s^{2} $$

B
$$1s^{2},2s^{2},2p^{6},3s^{1} $$

C
$$1s^{2},2s^{2},2p^{4},3s^{1},3p^{2} $$

D
$$1s^{1},2s^{1},2P^{6},3s^{2},3p^{1} $$

Solution

The electronic configuration of $$_{11}Na^{23}$$ is $$1s^{2},2s^{2},2p^{6},3s^{1}$$. It can also be written as $$[Ne]3s^1$$.
Two electrons are present in the first shell, 8 electrons are present in the second shell and 1 electron is present in the last shell.
Question 7
1 / -0

$$4^{th}$$ period ends with :

A
argon

B
neon

C
krypton

D
radon

Solution

$$[Ar] 3d^{10} 4s^{2} 4p^{6}$$ is the electronic configuration of last element of fourth period. The element is krypton.
Question 8
1 / -0

The pair of atomic numbers belonging to the same group are:

A
11, 20

B
12, 30

C
13, 31

D
14, 33

Solution

$$Z = 13 \:[Ne]\:3s^23p^1$$
$$Z = 31 \:[Ar]\:3d^{10}4s^24p^1$$
As valence electronic configuration is same, they belong to same group.
Question 9
1 / -0

Example of noble gas is

A
Helium

B
Argon

C
Xenon

D
all of these

Solution

From periodic table all the options have last shell fully filled & are non reactive hence all are Nobel gas
Question 10
1 / -0

The atomic number of an element x is 12. The element left to it and right to it in same period of periodic table are :

A
Be, Ca

B
Al, P

C
K, Li

D
Na, Al

Solution

Na has atomic number 11. Aluminium has atomic number 13.

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Re-Attempt Weekly Quiz Competition

Classification of Elements and Periodicity in Properties Test - 15

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Classification of Elements and Periodicity in Properties Test - 15

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Question 1

6

7

8

9

Solution

Question 2

Short periods - 1 and 2 and Long periods - 4 and 5

Short periods - 2 and 3 and Long periods - 5 and 6

Short periods - 2 and 3 and Long periods - 4 and 5

Short periods - 3 and 4 and Long periods - 6 and 7

Solution

Question 3

in the left-hand columns

in the top rows

in the right-hand columns

in the bottom rows

Solution

Question 4

$$2$$

$$2, 3$$

$$2, 2$$

$$2, 1$$

Question 5

first

second

third

zero

Solution

Question 6

$$1s^{2},2s^{2},2p^{5},3s^{2} $$

$$1s^{2},2s^{2},2p^{6},3s^{1} $$

$$1s^{2},2s^{2},2p^{4},3s^{1},3p^{2} $$

$$1s^{1},2s^{1},2P^{6},3s^{2},3p^{1} $$

Solution

Question 7

argon

neon

krypton

radon

Solution

Question 8

11, 20

12, 30

13, 31

14, 33

Solution

Question 9

Helium

Argon

Xenon

all of these

Solution

Question 10

Be, Ca

Al, P

K, Li

Na, Al

Solution

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