Bonding in the hydrogen chloride molecule can be explained by the valence bond theory in terms of an overlap between a. the 1s orbital of the hydrogen atom and the 1s orbital of the chlorine atom. b. the 1s orbital of the hydrogen atom and the 2s orbital of the chlorine atom. c. the 1s orbital of the hydrogen atom and the 2p orbital of the chlorine atom. d. the 1s orbital of the hydrogen atom and the 3s orbital of the chlorine atom. e. the 1s orbital of the hydrogen atom and the 3p orbital of the chlorine atom.

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

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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