If noble gases dont react in most conditions how is xe4f4 is formed

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

The valence of aluminum is +3, and the valence of the chlorine is -1. the formula fir the aluminum chloride is correctly written as

What best discribes the relationship between wavelength and frequency in a electromagnetic wave