Question Text
Question 2 :
Electrons are the kind of particles which revolve around the nucleus.
Question 4 :
It was known by 1900 that the atom was not a............. , ................particle but contained at least one sub-atomic particle the electron identified by J.J. Thomson.
Question 8 :
If two atoms are isotopes, in what characteristic do they differ?
Question 13 :
The electrode connected to the negative terminal of a battery in a discharge tube is called ________.
Question 15 :
According to J.J Thomson's atomic model, negative charges are embedded in:
Question 17 :
Assertion: <span>Metals are good conductors of heat and electricity.</span><br/>
Reason: <span>The positive nuclei are surrounded by a "sea" of mobile electrons.</span>
Question 19 :
In _________, J.J. Thomson discovered the electron, the first subatomic particle.
Question 20 :
Though the three fundamental particles are present in almost all elements, one element does not have one of them. Identify the particle<br/>
Question 23 :
Which of the following is true for mass and charge of electron?
Question 24 :
By charging the metal electrodes and gas inside the cathode ray tube :
Question 25 :
An atom of silicon has a mass number of $29$. How many neutrons does it have?
