Which part of the atom has to stay the same for it to be the same element? number of neutrons
number of protons
number of electrons
number of protons, neutrons, and electrons

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)

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0

Which of the following is most likely true about water in chemical solutions?