How many outer atoms and lone pairs are present in a molecule with a see-saw shape?

There are 4 outer atoms and lone pairs that are present in a molecule with a see-saw shape. It was called "seesaw" comes from the observation that it looks like a playground seesaw. It is very common that four bonds to a central atom result in tetrahedral or, less commonly, square planar geometry. 

Some of their tools are:
anemometer to measure wind speed,
Thermometer to measure temperature,
Hygrometer to measure humidity,
Barometer to measure air pressure.

Meteorologists also use computer programs to analyze information.