Question:
How does an electron differ from a neutron ?
Answer:
elecron has -ve charge but neutron has no charge
Structure of the Atom
Q 1.
Compare an electron, a proton and a neutron in respect of their relative masses and charges.
Q 2.
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 3.
Fill in the blanks :
Anode rays are also called ___________.
Q 4.
Who discovered protons?
Q 5.
Fill in the blanks :
In the three fundamental sub-atomic particles, _________ are negatively charged, _________ are positively charged and ____________ have no charges.
Q 6.
Describe briefly Thomson's model of an atom.
Q 7.
What is the relationship between an atom containing 11 protons, 11 electrons and 11 neutrons, and another atom containing 11 protons, 11 electrons and 12 neutrons ?
Q 8.
What is the absolute mass and charge of a proton ?
Q 9.
How many times is a proton heavier than an electron ?
Q 10.
On the basis of Rutherford’s model of an atom, which subatomic particle is present in the nucleus of an atom?
Q 11.
State the number of electrons present in the outermost shell of the atoms of the following elements :
(i) Neon(ii)Chlorine
Q 12.
What is the maximum number of electrons which can be accommodated in the L shell of an atom
Q 13.
What is the maximum number of electrons an M shell of the atom can accommodate ?
Q 14.
What is mass number?
Q 15.
Give one use each of the following radioactive isotopes :
(a)Uranium-235 (b) Cobalt-60
Q 16.
If an atom contains one electron and one proton, will it carry any charge or not?
Q 17.
What is ionization energy?
Q 18.
What is a neutron ? State its relative mass and charge.
Q 19.
Fill in the blanks :
Atoms are made up of __________, ___________ and __________.
Q 20.
Fill in the blanks :
The maximum number of electrons that can be accommodated in L-shell are _______.
Q 21.
Write a short note on Nucleus.
Q 22.
Fill in the blanks :
______ are atoms of the same element, which have same number of protons but different mass numbers.
Q 23.
Name the radioactive isotope which is used in the treatment of cancer.
Q 24.
Fill in the blanks :
Atomic number is equal to _____________.
Q 25.
Who discovered electrons?
Q 26.
What name is given to those isotopes which have unstable nuclei and emit various types of radiations ?
Q 27.
What are ?-particles?
Q 28.
State one use of radioactive isotopes in medicine.
Q 29.
What is the maximum number of electrons that can go into the N shell of an atom ?
Q 30.
How does an electron differ from a neutron ?
Q 31.
State one use of radioactive isotopes in industry.
Q 32.
What are canal rays?
Q 33.
What is Atomic Number? Who coined this term?
Q 34.
Fill in the blanks :
Rutherford's scattering experiment is related to to the size of ____________.
Q 35.
What were the important features of atomic model based on Rutherford's scattering experiment?
Q 36.
What is the maximum number of electrons which can be accommodated in the K shell of an atom
Q 37.
Name the fundamental particle not present in the nucleus of hydrogen atom
Q 38.
Fill in the blanks :
The mass number of an atom is equal to the number of ________ in its nucleus.
Q 39.
Name the particles which actually determine the mass of an atom.
Q 40.
Which shell of an atom can accommodate a maximum of
(a) 8 electrons?
Q 41.
State the location of electrons, protons and neutrons in an atom.
Q 42.
Give one example of a radioactive isotope which is used as a fuel in the reactors of nuclear power plants.
Q 43.
Who discovered X-Rays?
Q 44.
Draw a sketch of Bohr’s model of an atom with three shells.
Q 45.
Fill in the blanks :
________ rays are negatively charged.
Q 46.
Fill in the blanks :
The fundamental particle not present in hydrogen atom is __________.
Q 47.
Fill in the blanks :
Co-60 a radio isotope is used in treatment of __________.
Q 48.
Name the scientist who discovered electron.
Q 49.
Name the shell of an atom which can accommodate a maximum of
(a) 2 electrons (b) 18 electrons
Q 50.
Fill in the following blanks
Atomic
number | Mass number | Protons | Neutrons | Electrons | Symbol |
|---|
| 10 | 22 | ....... | ........ | ....... | ........ |
