Structure of the Atoms Test

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Structure of the Atoms Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

What is name given to the number of protons in the nucleus of the atom?

A
Mass number

B
Atomic number

C
Isotope

D
Isobar

Solution

The number of protons in the nucleus of an atom is equal to its atomic number (Z). The sum of the number of protons and neutrons present in a nucleus is called the mass number (A).
Question 2
1 / -0

There are 14 protons and 13 neutrons in the nucleus of an element. What is its mass number?

A
13

B
29

C
17

D
27

Solution

The mass number (A) of an atom is equal to the sum of the number of protons and neutrons present in the nucleus of the atom.

So, the mass number (A) of the given element = number of protons + number of neutrons = 14 +13 = 27 u
Question 3
1 / -0

Nitrogen atom has an atomic mass of 14 u and has 7 protons in its nucleus. How many neutrons does it have?

A
7

B
21

C
3.5

D
14

Solution

Atomic mass (A) of Nitrogen is 14 u and number of protons (p⁺) in the nucleus is 7. So, number of neutrons (n⁰) = Mass number (A) – number of protons (p⁺) = 14 - 7 = 7
Question 4
1 / -0

Atomic number of an atom is defined as:

A
The number of electrons they possess

B
The number of protons they possess

C
The number of neutrons they possess.

D
All of these

Solution

Atomic number (Z) is defined as the number of protons present in the nucleus of an atom.
Question 5
1 / -0

Which of the two will be chemically more reactive - an element X with atomic number 16 or an element Y with atomic number 17?

A
Element X

B
Element Y

C
Can’t say

D
Both the elements X and Y are equally reactive.

Solution

Electronic configuration of element X (Atomic number 16) is 2, 8, 6 and that of element Y (Atomic number 16) is 2, 8, 7. Element Y requires only one electron to complete the octet but X requires 2 electrons. So, Y will be more reactive.
Question 6
1 / -0

The atom of which element has twice as many electrons in its second shell as there are in the first shell:

A
Be

B
Li

C
C

D
N

Solution

Electronic configuration of Carbon (C) is 2, 4. The first shell contains 2 electrons and second shell contains 4 electrons. Hence, the number of electrons in its second shell is twice the number of electrons in its first shell.
Question 7
1 / -0

The two isotopic forms of chlorine with masses 35 u and 37 u occur in the ratio of:

A
1 : 3

B
2 : 1

C
3 : 1

D
1 : 2

Solution

Chlorine is found naturally in two isotopic forms having atomic mass of 35 u and 37 u. The two isotopic forms occur in the ratio of 3:1. That makes the average atomic mass of chlorine 35.5 u
Question 8
1 / -0

Find the incorrect pair:

A
Isotope of cobalt – Cancer treatment

B
Isotope of iodine – Cancer treatment

C
Isotope of Carbon – Radio carbon-dating technique

D
Isotope of Uranium – Fuel in nuclear reactor

Solution

An isotope of Uranium is used in nuclear reactor. Isotope of cobalt is used in treatment of cancer and an isotope of carbon is used for carbon-dating technique. Isotope of iodine is not used in cancer treatment.

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Structure of the Atoms Test - 8

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Structure of the Atoms Test - 8

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Question 1

Mass number

Atomic number

Isotope

Isobar

Solution

Question 2

13

29

17

27

Solution

Question 3

7

21

3.5

14

Solution

Question 4

The number of electrons they possess

The number of protons they possess

The number of neutrons they possess.

All of these

Solution

Question 5

Element X

Element Y

Can’t say

Both the elements X and Y are equally reactive.

Solution

Question 6

Be

Li

C

N

Solution

Question 7

1 : 3

2 : 1

3 : 1

1 : 2

Solution

Question 8

Isotope of cobalt – Cancer treatment

Isotope of iodine – Cancer treatment

Isotope of Carbon – Radio carbon-dating technique

Isotope of Uranium – Fuel in nuclear reactor

Solution

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