Structure of Atom - Fill in the blank exam questions Chemistry Part -3

41. __________ limits the number of electron to different shell or orbits.

42. Sir William Crookes in 1878, discovered that the cathode in high vacuum tube emit radiations what he called __________.

43. X-rays were discovered in 1895 by __________.

44. The discovery of proton was done in 1886 by __________.

45. Neutrons were discovered by __________ in 1932 by the bombardment of beryllium with alpha particles.

46. Each atom has a __________, which contains all the positive charge and practically all the mass of atom.

47. Complete the reaction: 4Be9 + 2H4 ® __________ + __________.

48. __________ have higher ionization power as compared to b-rays.

49. No dark spaces between the colours are present in __________.

50. The symbol e+ represents __________.

51. p-orbitals are __________ shaped.

52. The energy released when an electron is added to an atom in the gaseous state is called __________.

53. The power of an atom to attract a shared pair of electrons towards itself is called __________.

54. Fluorine is __________ electronegative than chlorine.

55. Lyman series of spherical lines appear in the __________ portion of spectrum.

56. The electrons with __________ spin occupy the same orbital.

57. 3d orbital has __________ energy than 4s orbital.

58. Energy and frequency are __________ proportional to each other.

59. Ionic radii of cations are __________ than the atoms from which they are formed.

60. Ionic radii of anions are __________ than the atoms from which they are formed.

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Structure of Atom - Fill in the blank exam questions Chemistry Part -2

21. The particles of Cathode rays possess __________ charge.

22. The negatively charged particles found in Cathode rays are named as __________.

23. Positive rays are emitted from __________.

24. __________ rays are also known as Canal rays.

25. __________ consists of helium ions and are doubly positively charged.

26. __________ rays consists of negatively charged particles.

27. __________ rays are light waves of very short wavelength.

28. The phenomenon in which a stable element is made radioactive by artificial disintegration is called __________.

29. The electron move around the nucleus in different circular paths called __________.

30. The maximum number of electron in a shell is determined by the formula __________.

31. A particle whose mass is equal to that of electron but carries a positive charge is called __________.

32. 2p electrons are __________ in energy that 2s electrons in the same atom.

33. Number of protons of an element also indicates its __________.

34. According to __________ Principle electrons are fed in the order of increasing orbital energy.

35. According to __________ electrons are distributed among the orbitals of a sub shell to give maximum number of unpaired electron and have same spin.

36. The specific way in which the orbitals of an atom are occupied by electrons is called __________.

37. __________ rays are stream of doubly positively charged particles.

38. Electron in the outer most shell of an atom is called __________.

39. Protons are found in the __________ of an atom and bear __________ charge.

40. The atomic number of an atom is the sum of __________ inside the nucleus.

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Chemistry - Fill in the Blanks model Questions Atomic Structure

1. The mass of a hydrogen atom is ------------------ kg. (JEE 1982)

answer: 1.66*10^-27 kg

2. When there are two electrons in the same orbital, they have ---------------- spins. (JEE 1982)

Answer: opposite or antiparallel

3. Isotopes of an element differ in the number of ______________ in their nuclei. (JEE 1982)

Anwer: neutrons


4. Elements of same mass number but of different atomic numbers are known as ----------.
(JEE 1983)

Answer: isobars


5. Fill in the blanks choosing appropriate words given with brackets)
the uncertainty principle and the concept of wave nature of matter were proposed by ----------------- and -------------------- respectively
(Heisenberg, Schrodinger, Maxwell, de Broglie)
(JEE 1988)

Answer: Heisenberg, de Broglie

Chemistry - Ture or False Type Questions in Atomic Structure

1. The outer electronic configuration of the ground state chromium atom is 3d⁴4s². (JEE 1982)

False

Chromium atomic number is 24.
Its our electronic configuration is 3d⁵4s² .

2. The energy of the electron in the 3d-orbital is less than that in the 4s-orbital in the hydrogen atom. (JEE 1983)
Ans: True.

Chemistry Past year IIT JEE question bank - Atomic Structure

1. Any p-orbital can accommodate up to

a. four electrons
b. two electrons in parallel groups
c. six electrons
d. two electrons with opposite spins
(JEE 1983)

Answer ( c )

2. the principal quantum number of an atom is related to the

a. size of the orbital
b. spin angular momentum
c. orbital angular momentum
d. orientation of the orbital in space
(JEE 1983)

Answer: (a)

3. Correct set of four quantum numbers forhte valence (outmost) electron of rubidium 9Z = 37) is:

a. 5,0,0,+1/2
b. 5,1,0, +1/2
c. 5,1,1,+1/2
d. 6,0,0,+1/2
(JEE 1984)

Answer: (a)

4. Bohr model can explain:

a. the spectrum of hydrogen atom only
b. spectrum of an atom or ion containing one electron only.
c. the spectrum o hydrogen molecule
d. the solar spectrum
(JEE 1985)

Ans: (b)

5. Which one of the following sets of quantum numbers(n,l,ml, ms) represents as impossible arrangement?
a. 3,2,-2,1/2
b. 4,0,0,1/2
c. 3,2,-3,1/2
d. 5,3,0,-1/2
(JEE 1986)

Answe ( c )

Entrance exam questions on Atomic Structure/ Periodic Table

Find the correct answer by clicking on the choice given.

1. What is the energy of one mole of light that has a wavelength of 400 nm?
	(a)	4.97 x 10-28 J
	(b)	4.97 x 10-19 J
	(c)	2.99 x 10-4 J
	(d)	2.99 x 105 J
2. Helium can be singly ionized by losing one electron to become the He+ cation. Which of the following statements is true concerning this helium cation?
	(a)	The line spectrum of this helium cation will resemble the line spectrum of a hydrogen atom.
	(b)	The line spectrum of this helium cation will resemble the line spectrum of a lithium cation.
	(c)	The line spectrum of this helium cation will remain the same as for unionized helium.
	(d)	The line spectrum of this helium cation will resemble the line spectrum of a lithium atom.
3. Which of the following atoms has the largest diameter?
	(a)	F
	(b)	Cl
	(c)	Br
	(d)	I
4. Which of the following ions has the smallest diameter?
	(a)	O2-
	(b)	Na+
	(c)	F-
	(d)	Al3+
5. Which of the following elements has the greatest electronegativity?
	(a)	Si
	(b)	P
	(c)	N
	(d)	O
6. Which element would have the greater difference between the first ionization energy and the second ionization energy?
	(a)	potassium
	(b)	calcium
	(c)	Both should have the same differences because they are in the same period of the periodic table.
7. Which element would have the higher electron affinity?
	(a)	chlorine
	(b)	bromine
	(c)	Both should have the same electron affinity because they are in the same group of the periodic table and both will gain only 1 electron.