Question:
What name is given to those atoms which contain the same number of protons and electrons but different number of neutrons ?
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.
Describe briefly Thomson's model of an atom.
Q 4.
Fill in the blanks :
Anode rays are also called ___________.
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.
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 7.
Who discovered protons?
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.
Give one use each of the following radioactive isotopes :
(a)Uranium-235 (b) Cobalt-60
Q 13.
What is the maximum number of electrons which can be accommodated in the L shell of an atom
Q 14.
What is the maximum number of electrons an M shell of the atom can accommodate ?
Q 15.
What is ionization energy?
Q 16.
What is mass number?
Q 17.
If an atom contains one electron and one proton, will it carry any charge or not?
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 :
______ are atoms of the same element, which have same number of protons but different mass numbers.
Q 21.
Fill in the blanks :
The maximum number of electrons that can be accommodated in L-shell are _______.
Q 22.
Write a short note on Nucleus.
Q 23.
Name the radioactive isotope which is used in the treatment of cancer.
Q 24.
Who discovered electrons?
Q 25.
How does an electron differ from a neutron ?
Q 26.
What are ?-particles?
Q 27.
What name is given to those atoms which contain the same number of protons and electrons but different number of neutrons ?
Q 28.
If A = 23 and Z = 11 for Na atom, how many protons, electrons and neutrons present in Na atom?
Q 29.
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 | Valency |
|---|
| 11 | 12 | ........ | ....... | ........ | ......... |
Q 30.
What is the maximum number of electrons that can go into the N shell of an atom ?
Q 31.
State the location of electrons, protons and neutrons in an atom.
Q 32.
State one use of radioactive isotopes in medicine.
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.
Fill in the blanks :
Atomic number is equal to _____________.
Q 36.
What is the maximum number of electrons which can be accommodated in the K shell of an atom
Q 37.
State one use of radioactive isotopes in industry.
Q 38.
(a) What are radioactive isotopes ? Give two examples of radioactive isotopes.
(b)Give any two uses of radioactive isotopes.
(c)An element Z contains two naturally occurring isotopes
Z and
Z. If the average atomic mass of this element be 35.5 u, calculate the percentage of two isotopes.
Q 39.
What are canal rays?
Q 40.
Fill in the blanks :
The fundamental particle not present in hydrogen atom is __________.
Q 41.
Which shell of an atom can accommodate a maximum of
(a) 8 electrons?
Q 42.
What is a proton ? How does it differ from a neutron ?
Q 43.
What name is given to those isotopes which have unstable nuclei and emit various types of radiations ?
Q 44.
What are isobars ? Explain with an example.
Q 45.
What were the important features of atomic model based on Rutherford's scattering experiment?
Q 46.
Fill in the blanks :
________ rays are negatively charged.
Q 47.
Given that the percentage abundance of the isotope
Ne, is 90% and that of the isotope
Ne, is 10%,calculate the average atomic mass of neon.
Q 48.
What is the mass of proton as compared to electron?
Q 49.
Fill in the blanks :
The fundamental sub-atomic particle called neutron was discovered by ___________.
Q 50.
What is the electronic configuration of a hydrogen atom
