Question Text
Question 1 :
Why did Rutherford select a gold foil in his $\alpha$–ray scattering experiment?
Question 2 :
Helium atom has a valency of zero, even after having 2 electrons in its valence shell, because
Question 3 :
How many electrons are there in the L shell of chlorine atom ?
Question 5 :
Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order
(i) Rutherford’s atomic model
(ii) Thomson’s atomic model
(iii) Bohr’s atomic model
Question 6 :
Rutherford’s α-particle scattering experiment led to the discovery of the ____________.
Question 7 :
Which of the following scientist identified the 'Stationary orbits' in the structure of an atom ?
Question 8 :
Which of the following scientist identified the 'Indivisibility of atoms' in the structure of an atom ?
Question 12 :
In the atom of an element X, 6 electrons are present in the outermost shell. If it acquires noble gas configuration by accepting requisite number of electrons, then what would be the charge on the ion so formed?
Question 13 :
One electron is present in the outer most shell of the atom of an element X. What would be the value of charge on the ion formed if this electron is removed from the outermost shell ?
Question 14 :
An element X has a mass number 4 and atomic number 2. Write the valency of this element?
Question 15 :
Which of the following is true for an element?
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic mass = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons.
