Acertain element forms an ion with 10 electrons and a charge of +2. identify the element.

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)

How can you use chemical equations to predict the products of the reaction you can carry out?

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5