Agaseous sample of this element is bombarded by photons of various energies in these same units. match each photon to the result of its absorption, or lack thereof, by an n = 1 electron.

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth

The plant food contains nh4)3po4 what tests would you run to verify the presence of the nh4 ion and the po4 ion