The electronegativities for the elements vary from 0.7 for cesium to 4.0 for fluorine. the electronegativity for iodine is 2.5. based entirely on the general guidelines for electronegativities and bond character:

a) binary compounds with iodine should all be polar covalent with a δ- on i.
b) binary compounds with iodine should all polar covalent with a δ+ on i.
c) compounds with iodine may be ionic, polar covalent, or nonpolar covalent.
d) no binary compounds with iodine should be substantially ionic.

a) binary compounds with iodine should all be polar covalent with a δ- on I.

Explanation:

Electronegativity can be defined as the ability of an atom to attract shared pair of electrons towards itself.

the correct answer is a) binary compounds with iodine should all polar covalent with a δ- on I.

The binary compounds as the name suggests are compounds made of two elements. Halogens being the most electronegative element in periodic table  , tend to attract the shared pair towards themselves. Iodine has high electronegativity and large atomic size hence it polarizes the electron cloud towards itself. Due to this it acquires a negative charge on it. therefore, bonds are polar with δ- charge on iodine.

8 carbon atoms forming single bonds with 18 hydrogen atoms; a triple bond exists between the third and fourth carbon atom from the right

explanation:

when atmosphere interacts with biosphere they focuses on on the sources and sinks of green house gases (ghgs) air pollutants, particular matters, water and energy between the earth's surface and the atmosphere. the biosphere affects the climate. the atmosphere and biosphere are in constant interaction with each other, and all living things rely on gases in the atmosphere for life. organisms such as animals take in oxygen gas form the atmosphere to use in every cell of their body for smooth functioning of daily routine exercises.