Nf3 and pf5 are stable molecules. write the electron-dot formulas for these molecules. on the basis of structural and bonding considerations, account for the facts that nf3 and pf5 are stable molecules but nf5 does not exist.this is the 1976 ap chemistry free response question, #9. couldn't quite figure out the answer. anyone know the answer?

1. reflected energy and melting sea ice*

2. The institutions gathered enough data for scientists to draw a conclusion about whether the annual global temperature is gradually increasing.

The data gathered by each institution is very similar to the data gathered by the other institutions.

Explanation:

The reflection of extra heat causes the sea ice to melt. This causes the sea ice to melt. This becomes a problem because the polar ice melts and contributes to the increase in the water content in the sea. This causes the rise in the sea levels.

The options (1) and (2) are correct because the institutions gathered enough data to reach plausible conclusions.