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NCERT Solutions for Class 10 Science Chapter 4 Carbon and its Compounds

This content is part of NCERT Solutions for Class 10 Science Chapter 4 Carbon and its Compounds

                                                                                                                 Different Kinds of Covalent Bonds :

 Electron pair shared between two atoms results in the formation of a covalent bond. This shared pair is also called bonding pair of electron.

˜   If two atoms share one electron pair, bond is known as single covalent bond and is represented by one

   dash (-)

 ˜   If two atoms share two electron pairs, bond is known as double covalent bond and is represented by two  

   dashed (=).

 ˜  If two atoms share three electron pairs, bond is known as triple covalent bond and is represented by

   three dashes (=).

 (i) Formation of double bond (oxygen molecule) : Two oxygen atoms combine to form oxygen molecule by sharing two electron pairs. Each oxygen atom (2, 6) has six electrons in the valence shell. It required two electrons to acquire nearest noble gas configuration. Therefore, both the atoms contribute two electrons each for sharing to form oxygen molecule. In the molecule, two electron pairs are shared and hence there is a double bond between the oxygen atoms.

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NCERT Solutions for Class 10 Science Chapter 3 Metals and Non-metals

This content is part of NCERT Solutions for Class 10 Science Chapter 3 Metals and Non-metals

GENERAL PROPERTIES OF METALS AND NON-METALS :

 7.3 (a) Electronic Configuration of Metals :

 The atoms of metals have 1 to 3 electrons in their outermost shells. For example, all the alkali metals have one electron in their outermost shells (lithium 2, 1; sodium 2,8,1: potassium 2,8,8,1 etc.)

Sodium, magnesium and aluminum are metals having 1,2 and 3 electrons respectively in their valence shells. Similarly, other metals have 1 to 3 electron in their outermost shells.

It may be noted that hydrogen and helium are exception because hydrogen is a non-metal having only  electron in the outermost shell (K shell) of its atom and helium is also a non-metal having 2 electron in the outermost shell (K shell).

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“ Roma House” Designed by Buro511 and Djamal Mustafaev.

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blueberry pudding cake

Follow for recipes

Is this how you roll?

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