Question 1 :
If number of electrons in an atom is 8 and number of protons is also 8, then what is the atomic number of the atom?
Question 2 :
Dalton’s atomic theory suggested that the atom was divisible and destructible. TRUE or FALSE ?
Question 3 :
Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?
Question 6 :
Which one of the following is a correct electronic configuration of sodium?
Question 7 :
Mass of neutron is nearly equal to that of electron. TRUE OR FALSE?
Question 8 :
An atom is divisible and consists of charged particles. TRUE OR FALSE?
Question 9 :
The mass of an electron is about $\frac{1}{2000}$ times that of proton.
Question 10 :
Atoms tend to achieve an octet in the outermost shell by sharing, gaining or losing electrons. TRUE OR FALSE?
Question 11 :
According to Rutherford, Radius of the nucleus is about ____ times less than the radius of the atom.
Question 13 :
If atomic number is 9 and number of neutrons is 10, then find number of protons.
Question 14 :
Chlorine occurs in nature in two isotopic forms, with masses 35 u and 37 u in the ratio of 3:1. Calculate the average atomic mass.
Question 16 :
If mass number is 24 and number of protons is 12, then find number of neutrons.
Question 18 :
An isotope of cobalt is used in the treatment of cancer.TRUE OR FALSE?
Question 19 :
An isotope of iodine is used in the treatment of goitre. TRUE OR FALSE?
Question 22 :
If atomic number is 9 and number of neutrons is 10, then find the mass number.
Question 24 :
If atomic number is 16, mass number is 32 and name of atomic species is Sulphur then find number of electrons.
Question 25 :
If Z = 3, what would be the valency of the element? Also, name the element.
Question 26 :
If mass number is 24 and number of protons is 12, then find name of the atomic species.
Question 27 :
If mass number is 1, number of neutrons is 0, number of protons is 1 and number of electrons is 1 then find name of atomic species.
Question 29 :
It was observed that the atoms of elements, completely filled with 8 electrons in the outermost shell show little chemical activity. TRUE OR FALSE?
Question 30 :
Thomson proposed the model of an atom to be similar to that of a Christmas pudding. TRUE OR FALSE?
Question 31 :
If mass number is 1, number of neutrons is 0, number of protons is 1 and number of electrons is 1 then find atomic number.
Question 32 :
An isotope of cobalt is used as a fuel in nuclear reactors.TRUE OR FALSE?
Question 35 :
The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes $^{16}_8X$ and $^{18}_8X$ in the sample?
Question 37 :
The number of electrons gained, lost or shared so as to make the octet of electrons in the outermost shell is called?
Question 38 :
An isotope of iodine is used for making tincture iodine, which is used as a medicine.
Question 40 :
J.J. Thomson proposed that the nucleus of an atom contains only nucleons. TRUE OR FALSE?
Question 41 :
The mass number is defined as the sum of the total number of protons and electrons present in the nucleus of an atom. TRUE OR FALSE?
Question 42 :
Atoms of the same element, having the same atomic number but different mass numbers are called?
Question 43 :
The electrons present in the outermost shell of an atom are known as?
Question 44 :
If atomic number is 16, mass number is 32 and name of atomic species is Sulphur then find number of protons.
Question 45 :
If Bromine atom is available in the form of, say, two isotopes $^{79}_{35}Br$ (49.7%) and $^{81}_{35}Br$ (50.3%), calculate the average atomic mass of bromine atom.
Question 46 :
An isotope of _______ is used in the treatment of goitre?
Question 47 :
The mass of an atom of any natural element is taken as the average mass of all the naturally occuring atoms of that element. TRUE OR FALSE?
Question 50 :
If atomic number is 9 and number of neutrons is 10, then find number of electrons.
