Elements Forming Ionic Compounds Attain Noble Gas Configuration by Either Gaining Or Losing Electrons from Their Outermost Shells. Give Reason to Explain Why Carbon Cannot Attain Noble Gas Configuration in this Manner to Form Its Compounds. - Science


Elements forming ionic compounds attain noble gas configuration by either gaining or losing electrons from their outermost shells. Give reason to explain why carbon cannot attain noble gas configuration in this manner to form its compounds.



The atomic number of carbon is 6. This means that it has 4 electrons in its outermost shell and it needs 4 more electrons to attain noble gas electronic configuration. It cannot form C4+ cation, as the removal of 4 valence electrons requires a huge amount of energy. The cation formed has 6 protons and 2 electrons. This makes it highly unstable. Carbon cannot form C4− anion, as its nucleus with 6 protons cannot hold 10 electrons. Thus, carbon achieves noble gas electronic configuration by sharing its 4 electrons with other elements—that is, it forms covalent compounds.

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2013-2014 (March) All India Set 1

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Write structural formula of Methane.

What are covalent compounds?

Name the type of bonds formed in ionic compounds and in the compounds formed by carbon.

Give reason why carbon compounds are generally poor conductors of electricity.

Explain the nature of the covalent bond using the bond formation in CH3Cl.

Write any three features and give two examples of covalent compounds

What type of chemical bond is formed between carbon and bromine?

What type of bonds are present in Cl2 molecule? Draw their electron-dot structures.

Fill in the following blank with suitable word:

The form of carbon which is known as black lead is ...........

State one test by which sodium chloride can be distinguished from sugar.

Draw the electron-dot structure of a hydrogen chloride molecule.

What type of bonding would you expect between Carbon and Chlorine? 

Explain why, diamond is hard while graphite is soft (though both are made of carbon atoms).


Draw the electron-dot structure of NHand state the type of bonding. 

State any two uses of diamond.

A hydrocarbon having one double bond has 100 carbon atoms in its molecule. The number of hydrogen atoms in its molecule will be
(a) 200
(b) 198
(c) 202
(d) 196

The electronic configurations of three elements X, Y and Z are as follows:

X 2, 4
Y 2, 7
Z 2, 1

(a) Which two elements will combine to form an ionic compound?
(b) Which two elements will react to form a covalent compound?
Give reasons for your choice.

What are the conditions necessary for the formation of covalent molecules?

Methane molecule is non-polar molecule. Explain.

What do you understand by lone pair of electrons ?

Complete the following:

In case of non-polar covalent bond, the covalent bond is formed in the ……………. Of atoms and shared electrons are …………. Distributed (corner, middle, equally, unequally).

Match the pairs.

Group 'A' Group 'B'
a. C2H6 1. Unsaturated hydrocarbon
b. C2H2 2. Molecular formula of an alcohol
c. CH4O 3. Saturated hydrocarbon
d. C3H6 4. Triple bond

Draw an electron dot structure of the following molecule. (Without showing the circle) :

Explain the following term with example.
Hetero atom in a carbon compound

Explain the following term with example.

Write answer as directed.
What causes the existance of very large number of carbon compound ?

The carbon compound is used in daily life is ______.

Explain the following briefly:
Cl2 is a non polar molecule, while HCl is a polar molecule.

(a) Compound X consists of molecules.
Choose the letter corresponding to the correct answer from the choices (a), (b), (c) and (d) given below
X is likely to have a :

Explain, why carbon tetra chloride does not dissolve in water?

Give reason as to why hydrogen chloride can be termed as a polar covalent compound.

What are the term defined below?

A bond formed by share pair of electrons, each bonding atom contributing one electron to the pair.

Draw the electron dot structure of covalent compound methane (non polar) and HCL (polar) and give two difference between them.

Covalent bonds can be single, double or triple covalent bonds. How many electrons are shared in each? Give an example of each type.

Taking MgCl2 as an electrovalent compound, CCl4 as a covalent compound, give four difference between electrovalent and covalent compounds

Potassium chloride is an electrovalent compound, while hydrogen chloride is a covalent compound, But, both conduct electricity in their aqueous solutions. Explain.

Name two compounds that are covalent when taken pure but produce ions when dissolved in water.

Define a covalent bond.

Give an example of the covalent bond formed by

(i) Similar atoms (ii) Dissimilar atoms 

In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compound?

What are Allotropes? Name any two allotropic forms of carbon. Give one use of it.

Fill in the blank and rewrite the completed statement:
Covalent compounds are generally soluble in _________ solvents.

Define the functional group and complete the following table. 

S.I. No. Functional Group Compound Formula
(1) ______________ _______________


(2) _______________ _______________ CH3CHO

Name two carbon compounds used in day-to-day life.

Number of valence electrons in a carbon atom is _______.

The bond between two oxygen atoms is _______ bond.

From the following hydrocarbon _______ is the cyclic hydrocarbon.

Write the molecular formula of the given compound.


Write an Explanation.


Write an Explanation.


Write a short note.

Characteristics of carbon

Write a short note.

Aromatic hydrocarbons

Complete the following activity.

Write the names of the hydrocarbons for the following structural formula.

(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)

|\phantom{....}|\phantom{....}|\\\ce{H - C - C - C - H}\\

Complete the following activity.

Write the names of the hydrocarbons for the following structural formula.

(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)


Complete the following activity.

Write the names of the hydrocarbons for the following structural formula.

(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)


List two differences between the properties exhibited by covalent compounds and ionic compounds.

Give an example for each of the following statement

A compound in which two Covalent bonds are formed. 

Give an example for each of the following statement.

Formation of coordinate covalent bond between NH3 ➝ BF3 molecules

Identify the incorrect statement and correct them.

  1. Like covalent compounds, coordinate compounds also contain charged particles (ions). So they are good conductors of electricity. 
  2. Ionic bond is a weak bond when compared to Hydrogen bond.
  3. Ionic or electrovalent bonds are formed by mutual sharing of electrons between atoms. 
  4. Loss of electrons is called Oxidation and gain of electron is called Reduction.
  5. The electrons which are not involved in bonding are called valence electrons.

Discuss in brief about the properties of coordinate covalent compounds.

The number of pi-bonds present in benzoic acid molecule are ______.

Consider the coordination compound, K2[Cu(CN)4]. A coordinate covalent bond exists between:

Which of the following is the purest form of carbon?

Cation is formed when ______.

Two carbon atoms can always form one or two covalent bonds.

`"CH"_3 - "CH"_2 - "OH" overset("Alkaline""KMnO"_4 + "Heat")(->) "CH"_3 - "COOH"`

In the above given reaction, alkaline KMnO4 acts as 

The bond which is formed by the mutual sharing of electrons is called ______ bond.

______ is an example of a covalent compound having a high melting point.

In covalent bond formation, the sharing of ______ electrons takes place in their outermost shell.

Molecular reactions are ______ in the covalent compound.

Write notes on the characteristics of covalent compounds.

Show the covalent bond formation in nitrogen molecule.

The number of single and double bonds present in a molecule of benzene (C6H6) respectively, are ______.


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