CHEMICAL BONDS

As per the octet rule, noble gases are stable in nature.  This is due to the presence of ……. Electrons in their outer most shell.

The element that would form cation due to loss of electron during the chemical reaction ……….

Atomic number of magnesium is 12.  Then its electron distribution is ……………

An element X has 6 electrons in the outermost shell.  Then the number of electrons shared by X with another atom to form a covalent bond is ………….

The compound that possesses high melting point is ……………

Bond in which the electrons are equally shared is …………

Pick out the wrong statement about the properties of covalent compounds.

CH4 is a/an ………….. compound.

The scientist who gave the octet rule.

The element which gives off an electron to become an anion.

The element which accepts an electron to become an cation.

Number of valence electrons in Magnesium.

Atomic number of sodium is ……………….

Bond in which electron pairs are equally shared is …………..

Electronic configuration of sodium atom

Valence electrons of Nitrogen.

Noble gases have ………… electrons in the valence shell.

Bonds in which electron pairs are not equally shared are called …………… bonds.

An atom which gives off electrons becomes a…………..

Covalent compounds are formed by ……………

Bonds in which electron pairs are equally shared are ………….. bonds.

Noble gases have …………… electrons in the outermost shell.

Covalent compounds are ……………. of electricity.

Match the following:      Element                              Atomic Number

1. Sodium -     a) 17
2. Magnesium -     b) 10
3. Chlorine -     c) 11
4. Neon - d) 12

Match the following: Element                               Valence Electrons

1. Magnesium - a) 6
2. Oxygen - b) 5
3. Sodium - c) 2
4. Nitrogen - d) 1

Match the following: Compound                                       Bonds

1. Sodium chloride - a) non-polar bond
2. Benzene - b) polar bond
3. Carbon monoxide - c) ionic bond
4. Water - d) Co-ordinate covalent bond

Match the following: 1) MgCl₂                            -     a) Co-ordinate covalent 2) Cl₂                                 -     b) Ionic component 3) NH₄                               -     c) Covalent compound