4. Draw the dots (o) and (x) Cross diagrams to show the bonding
the bonding of the following
of the following compounds
NH3

If we look at the molecular geometry of ammonia it has a trigonal pyramidal or distorted tetrahedral structure. This is mainly due to the presence of a lone non-bonding pair which usually exerts greater repulsion on the bonding orbitals.

i r r e l e v a n t

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.