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

Which atom in the ground state has a stable valence electron configuration?

Which statement is true? A reaction in which the entropy of the system decreases can be spontaneous only if it is exothermic. A reaction in which the entropy of the system increases can be spontaneous only if it is endothermic.

Why do regular sugar mints dissolve faster in liquids than sugar free mints?

For a particular reaction, ΔH° is 34.2 kJ and ΔS is 99.2 J/K. Assuming these values change very little with temperature, over what temperature range is the reaction spontaneous in the forward direction?

What systems are responsible for moving the gases oxygen and carbon dioxide?

Which scientist developed the quantum mechanical model of the atom? a. Albert Einstein c. Niels Bohr b. Erwin Schrodinger d. Ernest Rutherford

How are metal atoms arranged according to metallic bonding?

why would it not be necessary to heat the air in the balloon as much if the air outside the balloon is colder?

Are the relationships in group 7a consistent with the periodic trend that you have been studying

Which is not a property of a mineral? A. cleavage B. reflection C. magnetism D. color