Concept Map

Key Terms

atom

basic unit of matter, which consists of a central, positively charged nucleus surrounded by negatively charged electrons

atomic number

the number of protons in the nucleus of an atom

Bohr radius

the mean radius of the orbit of an electron around the nucleus of a hydrogen atom in its ground state

Brownian motion

the continuous random movement of particles of matter suspended in a liquid or gas

energy-level diagram

a diagram used to analyze the energy level of electrons in the orbits of an atom

hydrogen-like atom

any atom with only a single electron

shell

a probability cloud for electrons that has a single principal quantum number

subshell

the probability cloud for electrons that has a single angular momentum quantum number l$$

x rays

a form of electromagnetic radiation

More terms can be found in the textbook, chapter 30.