Which of the following statements is true? Elements in the same period have similar properties.
Elements in the same group have the same number of electron shells.
O A molecule must be made of two or more different elements.
The periodic table lists elements in ascending order of atomic numbers.

Which statement best summarizes the importance of ernest rutherford’s gold foil experiment? it proved that all of john dalton’s postulates were true. it verified j. j. thomson’s work on the atomic structure. it showed that an electron circles a nucleus in a fixed-energy orbit. it showed that a nucleus occupies a small part of the whole atom.