One isotope of nitrogen has 7 protons and 8 neutrons. which is the correct reference for this isotope?
a.
nitrogen-15
b.
nitrogen-8
c.
nitrogen-7
d.
nitrogen-1

Which produce would best increase the amount of heat energy that is actually gained by calorimeter b

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.

Three alkali metals in group 1 are a. calcium, strontium, barium b. boron, aluminum, gallium c. sodium, potassium, rubidium d. fluorine, iodine, chlorine