Structure of the Atoms Test

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Structure of the Atoms Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

What is a neutron?

A
A positively charge particle

B
A negatively charged particle

C
A neutral particle

D
None of these

Solution

Neutron is a neutral particle which exist in the nucleus. It decides the mass of the atom.
Question 2
1 / -0

The number of orbitals in $$n=3$$ are :

A
$$1$$

B
$$4$$

C
$$9$$

D
$$16$$

Solution

Given :
No. of shells $$\left( n \right) = 3 $$
Formula to calculate the number of orbitals is, number of orbitals $$= {n}^{2}$$
$$\therefore \text {Number of orbitals} = $$ $$ {n}^{2} = {\left( 3 \right)}^{2} = 9$$

Therefore, the option is $$C$$.
Question 3
1 / -0

In Rutherford experiment, most of the alpha particles go straight through the foil because________

A
Alpha particles are much heavier than electron.

B
Alpha particles are positively charged.

C
Alpha particles move with high velocity.

D
Most part of the atom is empty.
Question 4
1 / -0

What is the atomic number of oxygen?

A
$$9$$

B
$$15$$

C
$$8$$

D
$$16$$

Solution

The atomic number of oxygen is $$8$$. The mass of an atom is given by the sum of the number of protons and neutrons present in the nucleus. Also, the atomic number is the number of protons present in the nucleus. Since the number of neutrons present in oxygen is $$8$$, hence the atomic number of $$O$$ is $$8$$.
Question 5
1 / -0

What is the mass number of potassium $$_{19}K^{40}$$,?

A
60

B
45

C
90

D
40

Solution

The mass number of potassium $$(A)= 40$$. Therefore, the option $$D$$ is correct.
Question 6
1 / -0

Which term can be used for the number of protons present in an atom?

A
Atomic mass

B
Atomic number

C
Mass number

D
None of the above

Solution

The number of protons present in the nucleus of an atom is known as atomic number. It is also equal to number of electrons in the atom. So, option B is correct.

Atomic mass is the mass of an atom. Mass number is the total number of protons and neutrons in an atom.
Question 7
1 / -0

The mass number of a neutral atom is 31 electrons. What is the atomic number of this atom?

A
75

B
25

C
15

D
45

Solution

The M shell of the atom contains 5 electrons, is given. K and L shell will contain 2 and 8 electrons, respectively. So, the atomic number of this atom will be equal to total number of electrons as it is a neutral atom.

Atomic number = (2 + 8 + 5) = 15.
Question 8
1 / -0

Calculate the atomic number and mass number in the following case-

The atom of an element is made up of $$4$$ protons, $$5$$ neutrons and $$4$$ electrons.

A
5, 8

B
4, 9

C
2, 9

D
5, 10

Solution

Protons $$= 4,$$ neutrons $$= 5,$$ electrons $$= 4$$, Atomic number $$= 4,$$Mass number $$= 4 + 5 = 9$$
Question 9
1 / -0

What is the term used for the number of protons and neutrons present in the nucleus of an atom?

A
Atomic number

B
Mass number

C
Atomic mass

D
Molecular mass

Solution

The number of protons and neutrons present in the nucleus of an atom is known as mass number. The mass number is represented by $$A$$.
Question 10
1 / -0

What is the mass number of $$_{17}Cl^{35}$$ ?

A
21

B
25

C
39

D
35

Solution

The mass number of chlorine is 35. Therefore, the correct option is $$D.$$

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Re-Attempt Weekly Quiz Competition

Structure of the Atoms Test - 23

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Structure of the Atoms Test - 23

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Question 1

A positively charge particle

A negatively charged particle

A neutral particle

None of these

Solution

Question 2

$$1$$

$$4$$

$$9$$

$$16$$

Solution

Question 3

Alpha particles are much heavier than electron.

Alpha particles are positively charged.

Alpha particles move with high velocity.

Most part of the atom is empty.

Question 4

$$9$$

$$15$$

$$8$$

$$16$$

Solution

Question 5

60

45

90

40

Solution

Question 6

Atomic mass

Atomic number

Mass number

None of the above

Solution

Question 7

75

25

15

45

Solution

Question 8

5, 8

4, 9

2, 9

5, 10

Solution

Question 9

Atomic number

Mass number

Atomic mass

Molecular mass

Solution

Question 10

21

25

39

35

Solution

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