CBSE Questions for Class 9 Chemistry Structure Of The Atom Quiz 9 - MCQExams.com

In Rutherford's $$\alpha$$-ray scattering experiment most of the alpha particles:
  • are deflected by large angles
  • are deflected by small angles
  • pass straight through
  • None of the above
According to J. Chadwick, __________ is not found in hydrogen atom.
  • neutron
  • electron
  • proton
  • none of the above
___________ experimentally proved the existence of protons in the atom.
  • None of the above
  • Goldstein
  • J.J.Thomson
  • Chadwick
On the basis of Rutherford's particle scattering experiment, which of the statement is true:
  • There is a positively charged center in the atom which was termed as nucleus.
  • Almost all the mass of the atom is concentrated at the nucleus of the atom. 
  • The size of nucleus is very small relative to the size of the atom.
  • all of the above.
In 1932, ___________ discovered an electrically neutral particle in the atom named as neutron.
  • Rutherford
  • James chadwick
  • J.J. Thomson
  • none of the above
Protons and neutrons are heavier than electrons and reside in the centre of the atom, which is called ______ .
  • the nucleus
  • the Orbit
  • the orbitals
  • none of the above
The structure of the sodium atom is shown in the figure given alongside. Identify the correct statement.
There are _____________ no. of electrons in L shell.

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  • 2
  • 8
  • 11
  • 1
Which element has twice as many electrons in its second shell as compared to its first shell?
  • Calcium
  • Nitrogen
  • Oxygen
  • Carbon
Nucleus is composed of two kinds of subatomic particles: 
  • protons and neutrons
  • electrons and neutrons
  • protons and electrons
  • None of the above
Which of the following elements has odd number of electrons in its valence shell?
  • Hydrogen
  • Chlorine
  • Nitrogen
  • All of the above
Most of the mass of the atom resides in the _____ .
  •  nucleus
  • protons
  • neutrons
  • orbit
The electronic configuration of aluminium is:
  • $$\boxed {\begin{matrix}  K& L&M \\ 2&8 & 3\end{matrix} } $$
  • $$\boxed {\begin{matrix}  K& L&M&N \\ 1&2&8 & 3\end{matrix} } $$
  • $$\boxed {\begin{matrix} P&Q&R\\ 2&8 & 3\end{matrix} } $$
  • None of the above
Fill in the blank and complete the analogy by choosing correct alternative from the options given.
Neon : (2, 8) : : Argon : _________
  • (2, 8, 8)
  • (2, 8, 8, 8)
  • (2, 8, 18, 8)
  • (2, 8, 18)
Which element has three shells with $$5$$ electrons in its valence shell?
  • Nitrogen
  • Silicon
  • Phosphorous
  • Sulphur
In 1911, __________ came to the conclusion that the atom had a dense nucleus because most of the particles shot straight through, but some of the particles were deflected due to the dense nucleus of the gold atoms.
  • Thomson 
  • Chadwick
  • Rutherford
  • None of the above
According to J.J. Thomson's atomic model, negative charges are embedded in:
  • a positively charged sphere
  • a lump of neutral charge
  • a lump of small atoms
  • None of the above
Rutherford's alpha-particle scattering experiment was responsible for the discovery of:
  • atomic nucleus
  • electron
  • proton
  • neutron

In Thomson's plum-pudding model, electrons are not:
  • negatively charged
  • present in every type of atom
  • collected together in the center of the atom
  • scattered throughout a blob of positively charged material
How would you describe J. J. Thomsons model of the atom? 
  • An atom is indivisible
  • The atom is composed of only negatively charged particles.
  • The atom is composed of a positive core with negatively charged particles orbiting the positive core.
  • The atom is composed of diffused ball of positive charge with negative particles dispersed throughout.
How is the number of rings in the Bohr's model of any element determined?
  • Column number on periodic table
  • Atomic mass
  • Row number on periodic table
  • Atomic number
Which one of the following is electrically neutral?
  • Electron
  • Neutron
  • Proton
  • None of these
The net charge inside an atom is zero because :
  • the magnitude of positive charge is more than negative charge inside atom
  • the magnitude of positive and negative charge is same inside atom
  • the magnitude of positive and negative charge is same outside atom
  • the magnitude of positive charge is less than negative charge inside atom
In Thomson's model, _________ are embedded in a positively charged 'soup'.
  • electrons
  • neutrons
  • protons
  • ions
Which of the following disproved Thomson's model?
  • The nuclear model of an atom
  • The electron model of an atom
  • The atomic model of an atom
  • None of above
J.J. Thomson received noble prize in the year: 
  • $$1900$$
  • $$1906$$
  • $$1909$$
  • $$1920$$
According to Thomson, an atom consists of:
  • embedded electrons
  • positively charged uniform sphere
  • negatively charged nucleus
  • Both A and B
Atomic number of sodium is 11, it has following electronic configuration:
  • 2(K), 7(L), 2(M)
  • 2(K), 8(L), 1(M)
  • 2(K), 2(L), 7(M)
  • 2(K), 8(L), 2(M)
Thomson's model could not explain the :
  • stability of an atom
  • position of nucleus in an atom
  • scattering of alpha particles
  • all of above
Thomson's atomic model is also called :
  • water melon model
  • christmas pudding model
  • both a and b
  • none of above
The entire positive charge of the atom is located in the nucleus while the electrons are distributed in the vacant space around it. This statement was given by Thomson. 
  • True
  • False
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