Kossel-Lewis Approach to Chemical Bonding

Draw the structure of tetra cyano ethylene.

Calculate the number of lone pairs and bond pairs in ${\mathrm{SO}}_3$ molecule.

Write Lewis dot structure of carbon tetrachloride.

Why an element with $8$ electrons in the outer most shell is stable?

Find the formal charge of ${\mathrm{NF}}_3$.

An element $\mathrm{L}$ has $9$ protons and its valency is $1$. Another element $\mathrm{M}$ has valency $3 \mathrm{and} 5$. What is the difference in the number of electrons in $\mathrm{L} \mathrm{and} \mathrm{M}$ ?

Which of the following statements is true?

Lewis dot structure of ${\mathrm{C}}_2{\mathrm{O}}_4{\mathrm{H}}_2$.

What type of bonding is there between hydrogen and fluorine in $\mathrm{HF}$ molecule ?

According to Lewis structure the number of lone pair & bond pair of electrons in ${\mathrm{SO}}_4^{2-}$ion.

When ${\mathrm{NH}}_3$ reacts with ${\mathrm{BF}}_3$ then after the reaction

Write Electron dot structure of Sodium

What is the dot structure of HMnO₄

Give an example of a covalent bond formed by dissimilar atoms.

Which compound has both covalent as well as co-ordinate bonds?

What are the formal charges on $\mathrm{P}$ and $\mathrm{O}$ in the Lewis (electron dot) structure of the phosphate oxyanion represented in the figure?

Identify the name of the noble gas compound formed by the following reaction:

$\mathrm{Xe}\left(\mathrm{g}\right)+2\underset{\mathrm{excess}}{{\mathrm{F}}_2\left(\mathrm{g}\right)}\underset{7 \mathrm{bar}}{\overset{873 \mathrm{K} }{\to }}?$

Write the reaction for the formation of xenon difluoride.

Give 2 drawbacks of Kossel's Postulate.

Define group valency. What are the valencies of all the groups in the periodic table?