What are the horizontal (from left to right) parts of the periodic table called?

rows
periods
families

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

What is the percentage of hydrogen in nitrogen trihydride

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.