Neils bohr measured the eneray required to move the electron
hydrogen atom out of its ground state and the energy emitted when the
electron returned to its ground state. what did he learn about the structure of
the atom from this information?
a. the existence of the electron.
the law of multiple proportions.
c. the existance of the nucleus
d. that the electrons reside in the electron cloud in shells (or energy
levels) with fixed amounts of energy.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.

points

explanation: