Which determines the reactivity of an alkali metal? A) its boiling and melting points

B) the shininess of its surface

C) the number of protons it has

D) its ability to lose electrons

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Which radioisotope is used to date fossils? a. oxygen-16 b. carbon-14 c. uranium-238 d. carbon-12

How are casts formed by decaying organisms? organisms turn into rock over time. organisms leave carbon residue on a rock. organisms leave impressions in sediment that hardens into rock. impressions left by organisms are filled in with sediment that hardens into rock.

What is the volume in liters of 7500 g of helium atoms. assume stp conditions.