Which statement is true about oxygen -17 and oxygen-18, A they do not have the same number of protons. B there atoms have a identical mass. C they are isotopes of oxygen. D they have the same mass number .

Which statement describes the appearance of a temperature-vs.-time graph? a horizontal line shows that the temperature increases at a constant rate over time. a vertical line shows that the temperature decreases at a constant rate over time. horizontal lines where the temperature is constant during phase changes connect upward-sloping lines where the temperature increases. horizontal lines where the temperature increases are connected by upward-sloping lines where the temperature is constant for each phase.

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

What happens to isotopes that are unstable?