Atomic Structure Test

Result

Atomic Structure Test - 3

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Which of the following correctly represents the electronic distribution in the Mg atom?

A
3, 8, 1

B
2, 8, 2

C
1, 8, 3

D
8, 2, 2

Solution

The atomic number of Mg is 12.
According to Bohr's formula of distribution of electrons (2n² ), K shell (n=1) can accommodate 2 electrons, L shell (n=2) can accommodate 8 electrons and the rest 2 electrons are accommodated in the M shell.
So its electronic configuration is 2,8,2.
Hence, the correct option is (B).
Question 2
1 / -0

If gas in a discharge tube is changed, what will happen to the mass of cathode ray particles?

A
It will increase.

B
It will decrease.

C
It will remain the same.

D
It will depend upon the new gas introduced in tube.
Question 3
1 / -0

What is the charge on oxygen?

A
-2

B
+1

C
+2

D
-1

Solution

The charge on an oxygen ion is -2. An oxygen atoms contain six electrons in its valence electron shell
Question 4
1 / -0

Which sign will you use to complete the following relation?

Atomic number of an atom _______ Mass number of an atom

A

B
>

C

D
=
Question 5
1 / -0

What will be the mass number of an atom if the number of electrons, protons and neutrons is 8, 8 and 9, respectively?

A
16

B
20

C
18

D
17
Question 6
1 / -0

The mass of __________ is 9.107 10^–31 kg.

A
electron

B
proton

C
neutron

D
anode rays
Question 7
1 / -0

Cathode rays possess kinetic energy due to their _________.

A
mass and velocity

B
mass

C
velocity

D
speed
Question 8
1 / -0

Find the atomic number and mass number of an element for which the numbers of protons, neutrons and electrons are 10, 12 and 10, respectively.

A
22, 10

B
12, 12

C
10, 10

D
10, 22
Question 9
1 / -0

Anode rays are so called because:
(i)         they are produced at anode
(ii)        they get deflected towards anode
(iii)       they are positively charged

A
(i) and (ii)

B
(i) and (iii)

C
(ii) and (iii)

D
(i), (ii), (iii)
Question 10
1 / -0

An atom is electrically neutral because the number of electrons present in it is

A
more than the number of protons present in it

B
more than the number of neutrons present in it

C
equal to the number of protons present in it

D
equal to the number of neutrons present in it
Question 11
1 / -0

The ion of an element has 3 positive charges. The mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

A
13

B
10

C
14

D
16

Solution

Mass number (A) of the atom = 27
Number of the neutron in the atom =14
Number of Electrons=Mass number-Number of neutrons=27-14
Number of electrons= 13
Since ions of the element have 3 positive charges number of the electron in the ion is 13-3 which equals 10.
Hence, the correct option is (B).
Question 12
1 / -0

Charge to mass ratio of cathode ray particles is ________.

A
1.759 10¹¹ C/kg

B
1.957 10¹¹ C/kg

C
1.795 10¹¹ C/kg

D
1.975 10¹¹ C/kg
Question 13
1 / -0

Mass number of an element is ________.

A
number of protons or electrons

B
total number of protons and electrons

C
total number of protons and neutrons

D
total number of neutrons and electrons
Question 14
1 / -0

Which of the following scientists discovered electron?

A
Thomson

B
Goldstein

C
Chadwick

D
Rutherford
Question 15
1 / -0

If an atom has 10 protons and 11 neutrons, what will be its atomic number?

A
8

B
10

C
21

D
22
Question 16
1 / -0

Which of the following particles is/are not a part of the atomic nucleus?

A
Electrons

B
Protons

C
Neutrons

D
Both (2) and (3)
Question 17
1 / -0

Which gas has the highest e/m value with respect to its anode rays?

A
Argon

B
Nitrogen

C
Oxygen

D
Hydrogen
Question 18
1 / -0

Which of the following sub-atomic particles has/have 1 u relative mass and + 1 relative charge?

(i) Proton
(ii) Electron
(iii) Neutron

A
Both (i) and (iii)

B
Only (i)

C
Both (iii) and (ii)

D
Only (iii)
Question 19
1 / -0

If the atomic mass and atomic number of hydrogen are both equal to 1, then how many protons, electrons and neutrons are present in it?

A
1, 0, 1

B
1, 0, 0

C
0, 1, 1

D
1, 1, 0
Question 20
1 / -0

Which of the following statements is correct about a neutron?

A
It has mass of 1 u and relative charge of + 1.

B
It has mass of 1 u and no charge.

C
It has mass of 1 u and relative charge of – 1.

D
It has negligible mass and relative charge of + 1.