The elements in groups 3-12 are known as:
a. the transition elements.
b. the halogens.
c. the noble gases.
d. the alkali earth metals.

Agas diffuses 1/7 times faster than hydrogen gas (h2). what is the molar mass of the gas? 100.10 g/mol 98.78 g/mol 86.68 g/mol 79.98 g/mol

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

How does the value of the equilibrium constant show that a reaction reaches equilibrium very quickly? (a) the equilibrium constant is large. (b) the equilibrium constant is small. (c) the equilibrium constant is zero. (d) the value of the equilibrium constant does not show how quickly a reaction comes to equilibrium.