Question:
What is the maximum number of electrons an M shell of the atom can accommodate ?
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.
What is the maximum number of electrons which can be accommodated in the L shell of an atom
Q 12.
State the number of electrons present in the outermost shell of the atoms of the following elements :
(i) Neon(ii)Chlorine
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.
What is the maximum number of electrons that can go into the N shell of an atom ?
Q 29.
How does an electron differ from a neutron ?
Q 30.
State one use of radioactive isotopes in medicine.
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 is the maximum number of electrons which can be accommodated in the K shell of an atom
Q 36.
Name the fundamental particle not present in the nucleus of hydrogen atom
Q 37.
What were the important features of atomic model based on Rutherford's scattering experiment?
Q 38.
State the location of electrons, protons and neutrons in an atom.
Q 39.
Fill in the blanks :
The fundamental particle not present in hydrogen atom is __________.
Q 40.
Fill in the blanks :
The mass number of an atom is equal to the number of ________ in its nucleus.
Q 41.
Fill in the blanks :
Co-60 a radio isotope is used in treatment of __________.
Q 42.
Name the scientist who discovered electron.
Q 43.
Name the particles which actually determine the mass of an atom.
Q 44.
Which shell of an atom can accommodate a maximum of
(a) 8 electrons?
Q 45.
Fill in the following blanks
Atomic
number | Mass number | Protons | Neutrons | Electrons | Symbol |
|---|
| 10 | 22 | ....... | ........ | ....... | ........ |
Q 46.
Fill in the following blanks in respect of an atom of an element:
No.of
protons | No.of
neutrons | Mass number | Atomic
number | No.of
electrons | Symbol |
|---|
| 11 | 12 | ........ | ....... | ........ | ......... |
Q 47.
(a) Describe the Rutherford's model of an atom. State one drawback of Rutherford's model of the atom.
(b) The mass number of an element is 23 and it contains 11 electrons. What is the number of protons and neutrons in it ? What is the atomic number of the element ?
Q 48.
(a) Describe Bohr's model of the atom. How did Neils Bohr explain the stability of atom ?
(b) An element has an atomic number of 11 and its mass number is 23. What is the arrangement of electrons in the shells ? State nuclear composition of an atom of the element.
Q 49.
Give one example of a radioactive isotope which is used as a fuel in the reactors of nuclear power plants.
Q 50.
What name is given to those atoms which contain the same number of protons and electrons but different number of neutrons ?
