Chemistry

Structure of the Atom

Question:

Name the positively charged particle present in the atoms of all the element

Answer:

proton
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Structure of the Atom

Q 1.

Fill in the blanks :
Mass of a proton is __________ times the mass of an electron.

Q 2.

Fill in the blanks :
_________ are atoms of different elements which have same number of neutrons but different mass numbers.

Q 3.

Who discovered protons?

Q 4.

Fill in the blanks :
Atomic number is equal to _____________.

Q 5.

What are the properties of anode rays?

Q 6.

What are cathode rays?

Q 7.

On the basis of Rutherford’s model of an atom, which subatomic particle is present in the nucleus of an atom?

Q 8.

If A = 23 and Z = 11 for Na atom, how many protons, electrons and neutrons present in Na atom?

Q 9.

Fill in the blanks :
Atoms are made up of __________, ___________ and __________.

Q 10.

Fill in the blanks :
The maximum number of electrons that can be accommodated in K-shell are _______.

Q 11.

Who discovered electrons?

Q 12.

What is the mass of proton as compared to electron?

Q 13.

Write the limitations of J.J. Thomson's model of an atom.

Q 14.

Fill in the blanks :
The fundamental sub-atomic particle called neutron was discovered by ___________.

Q 15.

Fill in the blanks :
Nucleons are __________ and ___________.

Q 16.

What are ?-particles?

Q 17.

What is mass number?

Q 18.

Fill in the blanks :
__________ electrons are located in the outermost shell of an atom.

Q 19.

What are canal rays?

Q 20.

If an atom contains one electron and one proton, will it carry any charge or not?

Q 21.

Fill in the blanks :
The maximum number of electrons that can be accommodated in L-shell are _______.

Q 22.

What is ionization energy?

Q 23.

What is Atomic Number? Who coined this term?

Q 24.

Fill in the blanks :
In the three fundamental sub-atomic particles, _________ are negatively charged, _________ are positively charged and ____________ have no charges.

Q 25.

Fill in the blanks :
The mass number of an atom is equal to the number of ________ in its nucleus.

Q 26.

What were the important features of atomic model based on Rutherford's scattering experiment?

Q 27.

Fill in the blanks :
The _________ of an atom is dense, small in size and is positively charged.

Q 28.

What are the limitations of Rutherford’s model of the atom?

Q 29.

Who discovered neutrons?

Q 30.

Fill in the blanks :
______ are atoms of the same element, which have same number of protons but different mass numbers.

Q 31.

Fill in the blanks :
The fundamental particle not present in hydrogen atom is __________.

Q 32.

Fill in the blanks :
The total number of protons and neutrons in the nucleus of an atom is called its __________.

Q 33.

Fill in the blanks :
Valency is the __________ _____________ of an atom.

Q 34.

Name the fundamental particle not present in the nucleus of hydrogen atom

Q 35.

Fill in the blanks :
_______ are atoms having the same mass number but different atomic numbers.

Q 36.

Fill in the blanks :
Rutherford's scattering experiment is related to to the size of ____________.

Q 37.

Complete the following table.
ParticleElectronProtonNeutron
(i) Symbol__ __ __
(ii) Nature__ __ __
(iii) Relative Charge__ __ __
(iv) Absolute Charge__ __ __
(v) Relative Mass__ __ __
(vi) Absolute Mass__ __ __

Q 38.

Write a short note on Nucleus.

Q 39.

Who discovered X-Rays?

Q 40.

Describe Bohr’s model of the atom.

Q 41.

Draw a sketch of Bohr’s model of an atom with three shells.

Q 42.

Fill in the blanks :
An atom has mass number 27 and atomic number 13. The atom has _________ electrons, _____ protons and _______ neutrons.

Q 43.

Fill in the blanks :
________ rays are negatively charged.

Q 44.

Fill in the blanks :
Co-60 a radio isotope is used in treatment of __________.

Q 45.

What do you think would be the observation if the ?-particle scattering experiment is carried out using a foil of a metal other than gold?

Q 46.

What were the observations of Rutherford's ?-scattering experiment?

Q 47.

Who is known as 'Father of Nucleus Physics'?

Q 48.

Who discovered nucleus of an atom?

Q 49.

Describe briefly Thomson's model of an atom.

Q 50.

Fill in the blanks :
Anode rays are also called ___________.