Electromagnetic waves that are harmful to living things are

a. high energy waves or
b. both high energy and low energy waves

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false