Unit Test - Bonds (lonic & Covalent) Which type(s) of element(s) is/are involved in covalent bonds?
1.Metals and Nonmetals
2. Only Nonmetals
3. Only lons
4. Only Metals

Over the last 90 years, scientists have added to the body of evidence supporting the big bang theory. what is the latest piece of evidence discovered in 2014?

Which of the following is a physical change? a.burning a piece of wood b.sawing a piece of wood in half c.rust forming on an iron fence d.a copper roof changing color from orange to green

Which statement accurately represents the arrangement of electrons in bohr’s atomic model?