The length of time required for half of the radioactive atoms in a sample to decay is its

a. half-life.

b. relative date.

c. radioactive date.

d. period

A pentavalent cation atom has 20 and 15 neutrons as protons. Find the electron quantity and mass number respectively. (40 pts.) a) 20 and 15 b) 15 and 20 c) 15 and 35 d) 35 and 15 e) 10 and 20

Why are alkenes considered "unsaturated " a. They contain only single bonds c. They do not form polymers b. They are composed of carbon molecules d. They contain double bonds

What three compounds are produced by the combustion of hydrocarbon fuels?

Among the elements listed, which would show the largest increase between the second and third ionization energies and why? A. B B. P C. Ca D. Zn

How are plastic containers and paper containers the same

You are on an alien planet where the names for substances and the units of measures are very unfamiliar. Nonetheless, you obtain 19 quibs of substance called skvarnick.

How do you know if an element is an ion?

Which gas is not a greenhouse gas, A methane, B Water Vapor, C, Carbon dioxide, D, Nitrogen, E, Ozone

A very small equilibrium constant means ... a. an equal amount of reactants and products c. more products b. more reactants d. system isn't at equilibrium

What is in a banana? give me specifics?!