Structure of the Atoms Test

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Structure of the Atoms Test - 34

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Weekly Quiz Competition

Question 1
1 / -0

The atomic number of potassium is $$19$$. Hence the number of electrons in the $$N$$- shell will be

A
$$9$$

B
$$1$$

C
$$8$$

D
$$2$$

Solution

Atomic number of potassium is $$19$$. Electronic configuration is $$2, 8, 8, 1$$. Hence, the number of electrons in the $$N$$-shell is $$1$$.
Question 2
1 / -0

The size of the nucleus is approximately :

A
$$10^{-18}m$$

B
$$10^{-10}m$$

C
$$10^{-8}m$$

D
$$None\ of\ these$$

Solution

The size of nucleus is approximately of the order of $$10^{-15}m.$$
Question 3
1 / -0

Which of the following is one of the postulates of Rutherford's theory?

A
Electrons continuously lose energy

B
Electrons move in a spiral path around the nucleus

C
Electrons revolve in a specific path around the nucleus

D
Electrons revolve in a stationary orbit

Solution

According to Rutherford's theory, electrons revolve in a specific path around the nucleus. An atom has no net charge or they are electrically neutral because electrons are negatively charged and the densely concentrated nucleus is positively charged.

Hence, option C is correct.
Question 4
1 / -0

Rutherford's scattering experiment led to the conclusion that :

A
nucleus is very small in size

B
nucleus is very heavy and carries positive charge

C
most of the space in the atom is empty

D
all of these

Solution

Rutherford model of atom contained the features of a relatively high central charge concentrated into very small volume in comparison to the rest of the atom and this central region was named nucleus of the atom. Alpha particles are deflected at tiny concentrated center while for most of the part these rays go undeflected shows having large empty space.
Question 5
1 / -0

For an element with atomic number 19, the 19th electron will occupy:

A
$$L$$-shell

B
$$M$$-shell

C
$$N$$-shell

D
$$K$$-shell

Solution

Atomic number=$$19$$

Electrons per shell $$\longrightarrow 2,8,9$$

Maximum Electrons in $$K=2$$

Maximum Electrons in $$L=8$$

Maximum Electrons in $$M=18$$

$$\therefore 19^{th}$$ electron will occupy $$M-$$shell.

Hence, option $$B$$ is correct.
Question 6
1 / -0

The particle used by Rutherford in $$\alpha$$-ray scattering experiment was__________.

A
neutron

B
electron

C
helium nuclei

D
X-rays

Solution

Rutherford used $$\alpha$$-particles for scattering experiment. The $$\alpha-$$particles are Helium nuclei $$\left( { He }^{ 2+ } \right) $$. Thus the answer for given question is Helium nuclei.
Question 7
1 / -0

The nucleus of the hydrogen atom is called as:

A
neutron

B
electron

C
proton

D
nucleons

Solution

The nucleus of a hydrogen atom is called a proton as it has only one proton in it. Thus the correct answer is option $$C$$.
Question 8
1 / -0

The size of the nucleus is approximately:

A
$$10^{-18}$$ m

B
$$10^{-10}$$ m

C
$$10^{-8}$$ m

D
none of these

Solution

The approximate size of the nucleus is of the order $${ 10 }^{ -15 }m$$. As there is no option of $${ 10 }^{ -15 }m$$, the correct option is 'D'-none of these.
Question 9
1 / -0

Which of the following was not proposed by Thomson?

A
The negative and positive charges are equal in magnitude

B
The electrons revolve around the nucleus in circular paths

C
The electrons are embedded in a positive sphere

D
Atoms are electrically neutral

Solution

The electrons revolve around the nucleus in circular paths was first proposed by Rutherford, not by Thomson.
Question 10
1 / -0

Oxygen atom has an atomic mass of 16u and eight neutrons in its nucleus. What is its atomic number?

A
4

B
12

C
8

D
6

Solution

The atomic number of oxygen is 8. The mass of an atom is given by the sum of the masses of protons and neutrons present in the nucleus. Also, atomic number is the number of protons present in the nucleus. Since, the number of neutrons present in oxygen is 8 and given mass is 16. Therefore, the number of neutrons will be equal to $$8$$ i.e. $$16-8$$.

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Re-Attempt Weekly Quiz Competition

Structure of the Atoms Test - 34

Result

Structure of the Atoms Test - 34

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SHARING IS CARING

Question 1

$$9$$

$$1$$

$$8$$

$$2$$

Solution

Question 2

$$10^{-18}m$$

$$10^{-10}m$$

$$10^{-8}m$$

$$None\ of\ these$$

Solution

Question 3

Electrons continuously lose energy

Electrons move in a spiral path around the nucleus

Electrons revolve in a specific path around the nucleus

Electrons revolve in a stationary orbit

Solution

Question 4

nucleus is very small in size

nucleus is very heavy and carries positive charge

most of the space in the atom is empty

all of these

Solution

Question 5

$$L$$-shell

$$M$$-shell

$$N$$-shell

$$K$$-shell

Solution

Question 6

neutron

electron

helium nuclei

X-rays

Solution

Question 7

neutron

electron

proton

nucleons

Solution

Question 8

$$10^{-18}$$ m

$$10^{-10}$$ m

$$10^{-8}$$ m

none of these

Solution

Question 9

The negative and positive charges are equal in magnitude

The electrons revolve around the nucleus in circular paths

The electrons are embedded in a positive sphere

Atoms are electrically neutral

Solution

Question 10

4

12

8

6

Solution

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