Question Text
Question 1 :
The energy of an electron in the $n^{th}$ Bohr orbit of hydrogen atom is:
Question 2 :
The number of electrons, that atom can lose/gain /share during a chemical reaction is known as :
Question 3 :
While revolving in discrete orbits the electrons do not radiate energy. These orbits or shells are called .................. 
Question 5 :
Isotopes of iodine _______ is used in the treatment of goiter.
Question 6 :
The isotope which has the greatest number of neutrons is<font color="#333333"> :</font>
Question 7 :
The maximum number of electrons in the third shell of an atom can be ________.
Question 8 :
J.J. Thomson's atomic model could not justify the shielding of electrons from positive charges.
Question 13 :
Goldstein's work with anode rays of $H^+$ was apparently the first observation of the :
Question 15 :
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Their valencies respectively are:<br/>
Question 16 :
The salt of an oxyacid of a metal $M$ contains one sulphur and four oxygen atoms. The formula of the base formed by this metal $M$ is:
Question 19 :
Which of the following statement is incorrect according to Thomson's model of an atom?