Chemistry
What are the conditions necessary for the formation of covalent molecules ?
Answer
The necessary conditions for the formation of covalent molecules are:
- Both atoms should have four or more electrons in their outermost shells, i.e., non-metals (exceptions are H, Be, B, Al, etc).
- Both the atoms should have high electronegativity.
- Both the atoms should have high electron affinity.
- Both the atoms should have high ionization energy.
- The electronegativity difference between the combining atoms should either be zero or negligible.
Related Questions
Divide the following redox reactions into oxidation and reduction half reactions.
(i) Zn + Pb2+ ⟶ Zn2+ + Pb
(ii) Zn + Cu2+ ⟶ Zn2+ + Cu
(iii) Cl2 + 2Br- ⟶ Br2 + 2Cl-
(iv) Sn2+ + 2Hg2+ ⟶ Sn4+ + Hg22+
(v) 2Cu+ ⟶ Cu + Cu2+
Potassium (at No. 19) and chlorine (at No.17) react to form a compound. Explain on the basis of electronic concept :
(i) oxidation
(ii) reduction
(iii) oxidising agent
(iv) reducing agent.
Elements A, B and C have atomic numbers 17, 19 and 10 respectively.
(a) State which one is : (i) a non-metal (ii) metal (iii) chemically inert ?
(b) Write down the formula of the compound formed by two of the above elements.
Draw electron dot diagram and structure of :
(a) nitrogen molecule
(b) magnesium chloride
(c) methane