Phosphine has the formula PH3. Draw the dot and cross diagram oh phosphine molecule. Use outer shell electrons only.
Use O for Phosphorus.
Use X for hydrogen.

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)

One or more substances changing into one or more substances is an example of a

Will mark brainliest how many electrons can be held in the energy level n = 4?