Answer the following questions. 1. -pressure air masses usually produce weather.

2. -pressure air masses usually produce weather.

3. A stationary front means:

1. low pressure - unsettled weather

2. high pressure - fair weather

3. stationary front is a boundary at which the warm and cold air masses meet and stays 'stationary' as neither one of the air mass have the enough force to move the other.

Explanation:

unsettled weather (e.g. cloudy, windy, precipitation)

fair weather (much calmer)

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

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