An atom's atomic mass can be calculated by adding the number of protons and electrons.
true
false

Yes this is TRUE because ATOMIC MASS IS THE SUM OF THE NUMBER OF PROTONS AND ELECTRONS.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation:

economic impact of malaria is estimated to cost africa $12 billion every year. this figure factors in costs of health care, absenteeism, days lost in education, decreased productivity due to brain damage from cerebral malaria, and loss of investment and tourism.