Elements K and L have 12 and 17 protons respectively. If k has 24 neutrons and L has 36, in a tabular form identify the number of protons, neutrons and electrons possessed by the ions of the two elements.

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Apush or pull that moves or changes and object when to objects touch