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Atomic Structure

Description: atomic structure Structure of The AtomRutherford-s Model of AtomBohr-s Model of an AtomDistribution of Electrons in Different Orbits (Shells)
Number of Questions: 15
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Tags: atomic structure Structure of The Atom Rutherford-s Model of Atom Bohr-s Model of an Atom Distribution of Electrons in Different Orbits (Shells)
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Which of the following best describes a proton?

  1. A positive particle

  2. Alpha particle

  3. Particles present in the aqueous solution of an acid

  4. Nucleus of a hydrogen atom


Correct Option: D
Explanation:

 
 

The introduction of a neutron into the nuclear composition of an atom would lead to a change in the

  1. number of electrons

  2. chemical nature of the atom

  3. atomic number

  4. atomic weight


Correct Option: D
Explanation:

 
 

Which one of the following is an element?

  1. Electron

  2. Proton

  3. Neutron

  4. None of these


Correct Option: B
Explanation:

 
 

The element of atomic number 22 belongs to which of the following periods of the periodic table?

  1. Period 2

  2. Period 4

  3. Period 6

  4. Period 8


Correct Option: B
Explanation:

Period 4 elements contain 4 shells. Titanium atoms have 22 electrons and the shell structure is 2.8.10.2. As it contains 4 shells, so it belongs to the 4th period.

 
 

Which of the following is not suggested by Rutherford's alpha ray scattering experiment?

  1. Mass and energy are related.

  2. Nucleus of an atom is positively charged.

  3. Nucleus of an atom is very dense and hard.

  4. Nucleus of an atom is very small as compared to the size of the atom as a whole.


Correct Option: A
Explanation:

 
 

An element belongs to group 4 and period 2. The atomic number of the element is

  1. 6

  2. 5

  3. 8

  4. 7


Correct Option: A
Explanation:

An element belonging to group 4 will contain 4 electrons in the outermost shell and as it belongs to the 2nd period, it suggests that it contains 2 shells. Hence, the electronic configuration of this element would be 2,4 and the atomic number would be 6, i.e. carbon.

 
 

The element of atomic number 12 belongs to which of the following groups of the periodic table?

  1. 2nd group

  2. 3rd group

  3. 5th group

  4. 7th group


Correct Option: A
Explanation:

 
 

Which of the following is highly energetic electromagnetic radiation?

  1. Ultraviolet rays

  2. Visible radiations

  3. Infrared

  4. Microwaves


Correct Option: A
Explanation:

Ultraviolet (UV) light is an electromagnetic radiation with a wavelength from 400 nm to 10 nm, shorter than that of visible light, but longer than X-rays. Energy: 102 Electron Volts

 
 

Bohr's model can explain the

  1. spectrum of hydrogen only

  2. spectrum of an atom or ion containing one electron only

  3. spectrum of hydrogen molecule

  4. solar spectrum


Correct Option: B
Explanation:

The Bohr model gives almost exact results only for a system where two charged points orbit each other at speeds much less than that of light. This includes one-electron systems such as the hydrogen atom, singly ionised helium, etc.

 
 

Who discovered proton?

  1. Rutherford

  2. Goldstein

  3. Thomson

  4. Chadwick


Correct Option: A
Explanation:

He is widely credited with first splitting the atom in 1917 in a nuclear reaction between nitrogen and alpha particles, in which he also discovered and named the proton.

 
 

In the conversion of chlorine atom to chloride ion, there is a decrease in the

  1. atomic weight

  2. atomic number

  3. number of valence electrons

  4. All of the above


Correct Option: C
Explanation:

 
 

Where are the protons in an atom present?

  1. Outside the nucleus

  2. Inside the nucleus

  3. Both inside and outside the nucleus

  4. None of these


Correct Option: B
Explanation:

 
 

Which of the following radiations is an electromagnetic radiation with maximum wavelength?

  1. Ultraviolet rays

  2. X rays

  3. Radiowaves

  4. Infrared rays


Correct Option: C
Explanation:

 
 

Rutherford's alpha ray scattering experiment is related to the size of the

  1. atom

  2. atomic nucleus

  3. electron

  4. neutron


Correct Option: B
Explanation:

 
 

The stationary orbits are those orbits in which

  1. electrons do not move

  2. electron energy remains constant

  3. angular momentum of electron is equal to h/2pi

  4. electrons move by emitting radiations


Correct Option: B
Explanation:

 
 

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