If calcium lost two electrons it would have the same number of electrons as

How does light reflect off of mirrors and other types of surfaces?

A diffraction grating is illuminated simultaneously with red light of wavelength 670 nm and light of an unknown wavelength. The fifth-order maximum of the unknown wavelength exactly overlaps the third-order maximum of the red light.

The gun from the crime scene shows tool marks where the serial numbers are ground off. There are also tool marks on the bullets left behind.

What can you expect from moving 5500 feet higher?

A ball is thrown horizontally from the top of a 60.0-m building and lands 100.0 m from the base of the building. Ignore air resistance. How long is the ball in the air?

What type of wave passes through the spring in the frog toy? Why?

Different kinds of substances have different properties of metals

Magma appears to be rising underneath the mid-oceanic ridges. a. True b. False

The energy required to crack a material

two punds of water vapor at 30 psia fill the 4ft3 left chmaber of a partitioned system. The right chmaber has twice the volume of the left and is initially evacuated.