Which are compounds, which are elements and which are mixtures?

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as

The variability in marine salinity between habitats does not impact the fish living there. select the best answer from the choices provided t f