What is the mass, in kg, of a 2.12-g piece of lead

0.00212 kgs

Explanation:

one gram is equal to 0.001 kilograms

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.