Explain why each of these elements occur as diatomic molecules, Match the words in the left column to the appropriate blanks in the sentences on the right. triple
double
octet
single
duet
When two hydrogen atoms pair together, they form a bond to achieve a complete which is a stable configuration.
When two halogens poir together, they form abond to achieve a complete which is a stable configuration
to achieve a completo
When two oxygen atoma pair together, they form abond to achieve a complete which is a stable configuration
When two nitrogen atomo poir together, they form abond to achieve a complete which is a stable configuration

When two hydrogen atoms pair together, they form a  single bond to achieve a complete duet which is a stable configuration.

When two halogens poir together,they form a single bond to achieve a complete octet which is a stable configuration  

When two oxygen atoma pair together, they form a double bond to achieve a complete octet which is a stable configuration

When two nitrogen atoms pair together, they form a triple bond to achieve a complete octet which is a stable configuration

Explanation:

The tendency of atoms to achieve a noble gas configuration that is eight valence electrons is said to be octet rule.  This is done to attain noble gas configuration and stability.

In order to attain stability the atoms tends to have eight electrons in its valence shell which can be obtained by either by sharing of electrons or complete transfer of electrons.

Hydrogen has one valence electron each, so sharing of electrons result in formation of single bond and the same electron configuration as the Helium and thus complete its duet.

Halogens  have 7 valence electron each, so sharing of electrons result in formation of single bond. The stable noble gas configuration is attained and thus complete its octet.

Oxygen  has six valence electrons each, so sharing of two electrons result in a double bond. The stable noble gas configuration is attained and thus complete its octet.

Nitrogen  has 5 valence electrons, so sharing of three electrons result in a triple bond. The stable noble gas configuration is attained and thus complete its duet.