1: how are the properties of elements determined?
a.
by the outermost shell of electrons
b.
by the number of neutrons in an atom
c.
by the protons
d.
by the total number of atomic particles

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.

70 give a real life example showing how sensory neurons work with the motor neurons

Sodium chloride, nacl, is formed when a sodium atom transfers its electron to a chlorine atom. the difference in charge between the two atoms creates a(n) attraction that bonds them together.