Electron

Q.

Calculate the total mass and charge on 1 mole of electrons.

Q.

What is an electron? State its relative mass and charge.

Q.

A neutron is formed by an electron and a proton combining together and therefore, it is neutral.True or False.

1. True

2. False

Q. Difference between current and charge

Q.

What is the usual symbol for (a) an electron (b) a proton, and (c) a neutron?

Q. why does electron revolve around the nucleus?

Q. The ratio of mass of a molecule of X2 to that silver atom is 8 ratio 27 if the molar mass of silver is 108 gram identify the element x

Q.

What is the absolute mass and charge of an electron?

Q.

Name the negatively charged particle present in the atoms of all the elements.

Q.

Which sub-atomic particle was discovered by

(a) Thomson (b) Goldstein (c) Chadwick.

Q. Is possible in an atom to have 12 protons and 13 electrons

Q. Question 39
A gold sample contains $90\%$ of gold and the rest copper. How many atoms of gold are present in one gram of this sample of gold?

Q.

The subatomic particle called electron was discovered by:

Q.

What are the cathode rays composed of?

1. Only mass
2. Only charge
3. Both mass and charge
4. Neither mass nor charge

Q.

Which subatomic particle was discovered by:
(i) Chadwick?
(ii) Thomson?
(iii) Goldstein?

Q.

Do electrons affect atomic mass?

Q.

Mass of the electron is approximately 1837 times that of the proton.

1. True

2. False

Q.

Name the following.

A subatomic particle that is electrically neutral.

Q.

What is the name of the scientist who discovered the presence of a positively charged particle in an atom?

Q. Nucleus of an atom is Charged . Give reasons

Q.

According to J.J Thomson, an atom is a positively charged sphere. Which sub atomic particles are embedded in it?

1. Neutrons

2. Electrons

3. Protons

4. Canal Rays

Q.

How does an electron differ from a neutron?

Q.

Why gamma rays are ionising if they have neutral charge?

Q.

The mass of an electron is about $\frac{1}{2000}$ times that of a proton.

1. True
2. False

Q.

How will you determine the charge and the mass of a proton?

Q. Observe the following statements about cathode rays and choose the incorrect one.

1. Their characteristics depend on the nature of gas present in the cathode ray tube.
2. They travel in a straight line inside the tube
3. They cast a shadow of the metal cross placed in their path.
4. 
   They deflect towards the positive terminal in the electric field.
   

Q.

Name the subatomic particle whose relative charge is:
(a) +1
(b) -1
(c) 0

Q.

Given the isotope name potassium-57.Find the atomic number, mass number, number of protons, number of electrons, and number of neutrons in it.

Q. State whether the following statements are true (T) or false (F).

A	A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.
B	Canal rays are positively charged radiations which led to the discovery of protons.
c	Electrons are negatively charged sub-atomic particles having negligible mass.

Q. Question 2
If an atom contains one electron and one proton, will it carry any charge or not?