Which of the following it not a model?
a) periodic table of elements
b) h20
c) na + cl=> nacl
d) citric acid

the major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;