Lithium (LI) and oxygen (O) are both in period 2. They both have the same number of protons two electron shells the same number of electrons similar properties​

Asample of silver (with work function ? = 4.52 ev) is exposed to an ultraviolet light source (? = 200 nm), which results in the ejection of photoelectrons. what changes will be observed if: silver is replaced with copper (? = 5.10 ev) more photoelectrons ejected no photoelectrons are emitted fewer photoelectrons ejected more energetic photoelectrons (on average) less energetic photoelectrons (on average)

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

Which description best characterizes the motion of particles in a solid?