What are non renewable energy sources

After cloud droplets form, what must happen to them for precipitation to occur?

What do we call the rows on the periodic table? a. periodb. familyc. groupd. metals

Henry moseley used x-ray experiments to determine the atomic number of elements. how did his discovery contribute to the development of the periodic table? a.it confirmed that elements should be arranged in strict order of increasing atomic mass. b.it led to elements with similar atomic numbers being grouped together. c.it allowed the elements to be placed in strict order of increasing atomic number. d.it showed that the way mendeleev grouped elements together was completely wrong.