Some of the waves energy is always being dissipated as heat which will reduce the waves a. amplitude b. frequency c. speed d. wavelengtg

A

Explanation:

The amplitude of a wave is directly proportional to the energy it carries. Amplitude is the distance of displacement, by a particle of the wave, in the media in which it travels. The higher the energy in the wave the higher the amplitude and vice versa.  The frequency and wavelength of the wave (which are dependent on the type of wave) remain unchanged even with the change in amplitude.

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.

i'm pretty sure its b i might be wrong though!