On average, women and girls in developing countries walk 6 kilometers (approximately 3.5 miles) a day, carrying 20 liters (approximately 42 pounds/20 kgs) of
water. In some areas, it is common for this journey to take more than 15 hours a week. 1
L = 0.26 gal. If you had to carry 20 liters of water, how many gallons would that be
equivalent to?

it means there are 3 atoms of oxygen

yes

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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.