Electrons

Q.

Identify the electrical charge of Gamma rays.

1. Gamma rays are negatively charged

2. Gamma rays are positively charged.

3. Gamma rays do not have any electrical charge.

4. The charge associated with gamma rays vary

Q. Ions are charged particles, formed when an atom:

1. loses electrons
2. gains or loses electrons
3. gains electrons
4. shares electrons

Q.

Cathode rays are made up of-

1. 
   

   neutral particles

2. 
   

   positively charged particles

3. 
   

   negatively charged particles

4. 
   

   None of the above

Q.

True or False: The no. of protons and the no. of electrons in an atom of an element is always the same.

Q.

What are ions?

Q.

Cathode rays are made up of-

1. 
   

   neutral particles

2. 
   

   positively charged particles

3. 
   

   negatively charged particles

4. 
   

   None of the above

Q.

What are alpha particles?

1. Alpha particles are doubly charged hydrogen ions

2. Alpha particles are doubly charged helium ions

3. Alpha particles are single charged helium ions

4. Alpha particles have no positive ion

Q.

What is the sum of protons and neutrons known as?

Q.

The charge on an electron is _______ coulombs.

1. $-1.602\times {10}^{19}$
2. $+1.602\times {10}^{19}$
3. $+1.602\times {10}^{-19}$
4. $-1.602\times {10}^{-19}$

Q. Write a brief note on electrons.

Q.

What is Ionization Energy ?

Q.

An oil drop has 7.99 $\times$ ${10}^{-19}$ C charge. How many electrons does this oil drop has?

1. 2

2. 5

3. 3

4. 4

Q. The mass of the electrons is negligible when compared to protons.

1. False
2. True

Q. What is the electronic configuration of magnesium $\left({}_{12}^{24}Mg\right)$?

1. 2, 8, 2
2. 2, 9, 1
3. 2, 6, 4
4. 2, 8, 3

Q. Substances having same number of electrons but different mass is known as:

1. isotopes
2. isobars
3. allotropes
4. isotones