(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

What are cathode rays? How are these rays formed?

What is the nature of the charge on Cathode rays .

If an atom contains one electron and one proton, will it carry as a whole is neutral

Which sub-atomic particle was discovered by Chadwick.

Name the sub-atomic particle whose charge is -1.

Give the symbol and charge of each particle. 

Explain the rule according to which electrons are filled in various energy levels.

Write down the electronic configuration of the following:

(a) `""_13^27"Y"`

(b) `""_17^35"Y"`

Write down the number of electrons in X and neutrons in Y.

What are inert elements?

What are valence electrons? 

Element X has electronic configurations 2, 8, 18, 8, 1. Without identifying X,

1. Predict the sign and charge on a simple ion of X.
2. Write if X will be an oxidizing agent or a reducing agent. Why?

Choose the correct option

The number of valence electrons in O^2- is :

An atom X has three electrons more than the noble gas configuration. What type of ion will it form?

The electronic configuration of fluoride ion is the same as that of the neon atom. What is the difference between the two?

An element A has 1 electron in its first shell. It combines with element B having 7 electrons in its third shell. What type of bond is formed?

Choose the correct option:

The mass number of an atom whose unipositive ion has 10 electrons and 12 neutrons is :

If electrons are getting added to en element Y; then

Is Y getting oxidized or reduced?

If electrons are getting added to en element Y; then

What charge will Y migrate to during the process of electrolysis?

Explain the following:

Atoms combine by transfer and sharing of an electron(s).