A is the amount of atoms in exactly 4 grams of Helium. Select one:
a. formula mass
b. atomic mass unit
c. mole
d. kilogram

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.