Question 1 :
Which of the following correctly represent the electronic distribution in the Mg atom?

Question 2 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2b2f59b460d7261f60c.JPG' /> Find out the valency of atoms represented by the figure.

Question 3 :
An atom with 3 protons and 4 neutrons will have a valency of

Question 4 :
Helium atom has a valency of zero, even after having 2 electrons in its valence shell, because

Question 5 :
The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40. What is the name given to such a pair of elements?

Question 6 :
Which of the following is the correct electron distribution of chlorine atom ? (Atomic number of chlorine is 17).

Question 7 :
Rutherford’s α-particle scattering experiment led to the discovery of the ____________.

Question 9 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2b2f59b460d7261f60c.JPG' /> Find out the valency of atoms represented by the figure.

Question 10 :
In the Thomson’s model of atom, which of the following statments are correct? (i) the mass of the atom is assumed to be uniformaly distributed over the atom (ii) the positive charge is assumed to be uniformaly distributed over the atom (iii) the electrons are uniformaly distributed in the positively charged sphere (iv) the electrons attract each other to stabilise the atom.