English

Define Covalent Bond - Chemistry

Advertisements
Advertisements

Question

Define: Covalent bond

Definition

Solution

Covalent bond— When atoms of different non-metals neither donate nor accept electrons and hence no ions are formed, such a bond is called covalent bond.

shaalaa.com
  Is there an error in this question or solution?
Chapter 4: Atoms, Molecules and Radicals - Additional questions

APPEARS IN

Selina Concise Chemistry [English] Class 7 ICSE
Chapter 4 Atoms, Molecules and Radicals
Additional questions | Q 12.2

RELATED QUESTIONS

TRUE \ FALSE

Neils Bohr gave the theory to explain the arrangement of protons in an atom.


WRITE SHORT ANSWER

Name three inert gases.


Write the names of the elements present in the:- 

Glucose


Write the names of the elements present in the:-

Sodium hydroxide


What is the maximum number of electrons present in:

1. first shell
2. second shell
3. third shell and
4. fourth shell


A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.

What is the atomic numebr of X ?


Fill in the blank

A charged particle is called an _____


Fill in the blank

An _______ is electrically neutral.


Why is it not possible to see an atom even with the most powerful microscope ?


Is it possible to see atoms these days ? Explain your answer.


Which of the following statement is correct about the atom of an element ?


Give scientific reason.

All the mass of an atom is concentrated in the nucleus.


Elements X and Y have 1 and 7 electrons in their outermost shell respectively.

Which element will gain electron?


A radical take part – unsplit in a chemical reaction and retains its identity in reactions.
With reference to the radical –

  1. ammonium
  2. bisulphate
  3. carbonate

state the group of atoms present in each radical.


An atom of an element has no electron. Will that atom have any mass or not? Can an atom exist without electron? If so then give example.


Give the salient features of “Modern atomic theory”.


A change in the physical state can be brought about


You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?


Write any two observations which support the fact that atoms are divisible.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×