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Atomic Structure

Total questions: 50

Worksheet time: 51mins

Name
Class
Date
1.

Mass of proton is

a)

1.6726×10^–27g

b)

9.1095×10^–31kg

c)

1.6726×10^–24 g

d)

5.4858amu

2.

Which atomic orbital has highest energy

a)

4d

b)

4f

c)

5s

d)

5p

3.

The value of four quantum numbers of valence electron of an element are

n = 4, = 0, m = 0 and s = +1/2. The element is

a)

Li

b)

K

c)

Sc

d)

Na

4.

The atomic number of an element is 30. How many s, p and d-electrons respectively it possesses in ground state?

a)

8, 19, 8

b)

8, 12, 10

c)

10, 15, 10

d)

8, 18, 11

5.

The principal quantum number of an atom is related to

a)

Orientation of orbital in space

b)

Spin of electron around its own axis

c)

Size of the orbital

d)

Shape of orbita

6.

The third electron of Li atom will have quantum number values

a)

A

b)

B

c)

C

d)

D

7.

The ground state electronic configuration of nitrogen atom can be represented as

a)

A

b)

B

c)

C

d)

D

8.

The set of elements which violates Auf bau principle is

a)

Cr and Co

b)

Cu and Co

c)

Cr and Cu

d)

Cr and M

9.

The shape of 1s, 2s and 3s is

a)

Different

b)

Linear

c)

Similar

d)

Flate

10.

The value of n = 3. What are probable values of azimuthal quantum number ‘ ’

a)

0,1,2,3

b)

0,1,2

c)

0,1

d)

1,2,3,4

11.

Which one is the correct order of frequency of radiations?

a)

-ray > UV rays > red rays> microwave rays

b)

UV-rays > -rays > red rays > microwave rays

c)

Microwave rays > red rays > UV rays> -ray

d)

Microwave rays > UV rays > red rays > -ray

12.

A photon of light moving with energy 3.3 × 10&–30 J. The frequency of photon is

(h = 6.6 × 10^–34 Js)

a)

500 Hz

b)

0.5 × 10^–30 Hz

c)

5000 Hz

d)

2.5 × 10^–4 Hz

13.

The nucleon number of 8O−2

is:

a)

8

b)

10

c)

16

d)

24

14.

In a chemical specie there are 26 protons, 24 electrons and 30 neutrons, it may be:

a)

Fe

b)

Mn

c)

Fe^+2

d)

Zn^+2

15.

The number of unpaired d electrons retained in Cu^2+ (At.Number of Cu = 29) ions is

a)

2

b)

5

c)

1

d)

0

16.

Which is incorrect statement

a)

e/m value of electron is 1.7588×10^11 C/kg

b)

Protons are deflected in electric field

c)

Protons produce flashes on striking Zns plate

d)

Wave number ( v ) is reciprocal of frequency (v)

17.

Which of the following fundamental subatomic particle is different in number than others in the sodium atom?

a)

Protons

b)

Neutrons

c)

Electrons

d)

All are equal

18.

Which of the following sets of quantum number is correct for an electron in 4f

orbital?

a)

n = 4, l= 3, m =+4

b)

n = 4, l= 3, m =+1

c)

n = 4, l= 4, m =− 4

d)

n = 3, l= 2, m =− 2

19.

Which is not deflected by magnetic field

a)

Neutron

b)

Proton

c)

Alpha particles

d)

Electron

20.

The electronic configuration of a dipositive ion is 2, 8, 17 and atomic mass is 65. The number of neutrons in the nucleus would

a)

38

b)

65

c)

36

d)

29

21.

Match list I and list II and pick the correct matching from given codes

a)

A–1, B–3, C–4, D–2

b)

A–3, B–1, C–4, D–2

c)

A–3, B–4, C–2, D–1

d)

A–1, B–3, C–2, D–4

22.

With the increase in value of principal quantum number which one will not change

a)

Size of s-orbitals

b)

Energy of p-orbitals

c)

Shape of p-orbitals

d)

Size of p-orbitals

23.
a)

A

b)

B

c)

C

d)

D

24.

Total fundamental sub atomic particles are present in hydride ion (H–):

a)

1

b)

2

c)

3

d)

4

25.

The electrons in a sub-shell are filled according to formula

a)

2n^2

b)

2(2l+1)

c)

2l+1

d)

n^2

26.

Deduce the number of protons, neutrons, electrons and nucleons from the given

specie

39

19 K

a)

A

b)

B

c)

C

d)

D

27.

Which of the following is the shape of one of the d-orbital?

a)

A

b)

B

c)

C

d)

D

28.

The positive charge in nucleus of an atom is due to a fundamental particle called

a)

Neutrons

b)

Protons

c)

Electrons

d)

Neutrino

29.

The shapes of orbitals can be determined by

a)

Spin quantum number

b)

Azimuthal quantum number

c)

Principal quantum number

d)

Magnetic quantum number

30.

The number of degenerate orbitals in p–subshell is

a)

2

b)

3

c)

5

d)

7

31.

The isoelectronic pair like argon is

a)

Cl^-, Ca^2+

b)

F^-,Na^+

c)

Cl^-,Na^+

d)

He,Ne

32.

The total number of orbitals containing electrons, if atomic number of the element is 19

a)

9

b)

6

c)

10

d)

16

33.

A(An) ______ is a region of space in which there is a high probability of finding an electron in an atom

a)

Shell

b)

Nucleus

c)

Atomic orbital

d)

Main energy level

34.

Cathode rays and canal rays when pass through electric field they wil

a)

Deflect towards negatively charged plate only

b)

Deflect towards positively and negatively charged plates respectively

c)

Deflect towards positively charged plate only

d)

Not deflect towards negatively charged plate and positively charge plate

35.

Atoms of two different elements having same nucleon number but different proton number are called

a)

Isotopes

b)

Isoelectronic

c)

Isotones

d)

Isobars

36.

A di-valent cation having 10 electrons and 24 nucleon number. The number of

neutrons ar

a)

11

b)

12

c)

10

d)

24

37.

The wavelength of Lyman Series lies in the region

a)

U.V

b)

Visible

c)

I.R

d)

X.rays

38.

Positive ions are formed from the neutral atom by the loss of

a)

Protons

b)

Neutrons

c)

Electrons

d)

Positrons

39.

e/m value for positive rays is maximum for

a)

Helium

b)

Hydrogen

c)

Oxygen

d)

Nitrogen

40.

Lines of Paschen series are produced when electrons jump from higher orbit to

_______ orbit

a)

1st

b)

2nd

c)

3rd

d)

4th

41.

According to Bohr’s atomic model, radius of first orbit of hydrogen atom is

a)

0.529Å

b)

2.11 Å

c)

4.0 Å

d)

0.52 m

42.

An orbital can have maximum two electrons with opposite spins according to

a)

Heisenberg’s Principle

b)

Auf Bau Principle

c)

Hund’s rule

d)

Pauli exclusion Principle

43.

Which particle has a greater wavelength

a)

Proton

b)

Neutron

c)

Alpha-particle

d)

Electron

44.

The mass of a proton is 1837 times more than that of _____

a)

Neutron

b)

Electron

c)

Positron

d)

Alpha-particle

45.

The limiting lines shows that the energy difference between the first level and the _____

a)

Second

b)

Third

c)

Fourth

d)

Infinite

46.

How do the ‘p’ orbitals Px, Py, Pz differ from each other

a)

Size

b)

Shape

c)

Orientation

d)

Capacity

47.

Magnetic quantum number is related to

a)

Size of orbit

b)

Shape of orbital

c)

Orientation of orbital

d)

Spin of electron

48.

In magnesium atom, in ground state, the number of electron with m = 0 are

a)

4

b)

6

c)

2

d)

8

49.

The two electrons in the K-shell will differ in

a)

Principal quantum number

b)

Azimuthal quantum number

c)

Magnetic quantum number

d)

Spin quantum number

50.

According to Plank’s Quantum theory, Greater the energy of electromagnetic

radiation, lesser will be the _______

a)

Wavelength

b)

Frequency

c)

Wave number

d)

Both “B” and “C”

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