PLEASE HURYY What does the half-life of a radioisotope refer to?
A. The length of time the radioisotope exists as a parent element
B. Half of the total energy that will be released by a radioactive
sample
C. The length of time it takes for half of a radioactive sample to
decay
D. Half of the length of time the radioisotope remains radioactive

Which of these best describes an ionic bond?

Connect the whole numbers on the periodic table to indicate what they represent?

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.