Which element has atoms with valence electrons in a higher energy level than those of calcium (Ca)? bromine (Br)

oxygen(O)

cesium (Cs)

lithium (Li)

Astone is thrown into a pond. what happens to the amplitude of the resulting waves as they get farther from the point where the stone hit the water? explain.

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.

What are known as the properties of substances that describe a substance et does not change that substances?