Which unit can be used to express the concentration of a solution?
(1) l/s (3) ppm
(2) j/g (4) kpa

What is the mass of 0.46 mol of mgcl2

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided