What are the kinds of molecules?
The molecules and the matter The molecules of one substance are alike in properties, but they differ from other substance molecules, the molecule is composed of tiny structural units called the atoms, A molecule...
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The importance of ultrasonic waves in medical diagnosis
Medical diagnosis Ultrasonic waves are used nowadays in many medical investigations and laboratory tests such as detecting the sex of the embryo and his health state, This process depends on the ability of different...
Classification of metals according to their chemical activity and What is the chemical activity of metals?
Metals can be classified according to their chemical activity into three groups which are very active metals, less active metals, and inactive metals. The high reactivity of active metals makes them useful in a...
What are the stages of embryo (fetus) development?
The fetus development the fertilization occurs about two weeks after the first day of the last menstrual period when the sperm penetrates the egg, and within 24 hours after the fertilization, the egg begins...