The image shows a portion of the periodic table. Which two elements have similar characteristics?

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)

This is a mixture that has the same composition throughout.

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer