what are two major branches of natural science?
2-How do matter and energy differ ?
3- Define an atom and molecule
4-What are tue three basic subatomic particles?
What is ionization?
6-What is the formula used to dtermine the maximum number of electrons that can be contained in a giving shell? How many electrons can be contained in the N shell?
7- The periodic table of elements arranges the elements into periods and group. How are the elements similar within each period and within each group ?
8- How do radiationa differs along the electromagnetic specptrum?
9- list 5 types of energy
10-For electromagnetic radiation what is the relationship between frequency and wavelength and between frequency photon energy
11-List five properties of Xrays
