10. A sample of helium gas is in a closed system. The volume of the gas sample is changed when both the temperature and the pressure of the
sample are increased. Compare the number of gas molecules of helium
gas initially and after the temperature and pressure are increased (1 pt)

there is none because earth is stationary and flat.

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.

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