What number of valence electrons generally indicates a full outer energy level ?

Explanation:

An atom of a group 17 element such as chlorine has seven valence electrons. It is “eager” to gain an extra electron to fill its outer energy level and gain stability

from

explanation:

wind is defined by the direction it blows from.   for example, a wind blowing from north to south is called a northerly wind.

c)as speed changes, wavelength and frequency change.

everything changes!