Theses mystery elements are at the top of their families on the periodic table . An element C is likely to have which properties ? A. Two valence electrons B. Six valence electrons , gas , non metals C. Six valence electrons , solid nonmetal. D. Two valence electrons , solid nonmetal. It's science

Which fact represents evidence for the big bang theory?

Answer explain why it is not possible to deduce a complete order of reactivity.

A2-kg bowling ball is 1 meter off the ground on a post when it falls. just before it reaches the ground,its traveling 4.4 m/s. assuming that there is no air resistant, which statement is true a. the initial potential energy is less then the final kinetic energy b. the mechanical energy is not conserved c. the mechanical energy is conserved d. the initial potential energy is greater than the final kinetic energy