The word atom goes back to a Greek origin , meaning the indivisible , Scientists put different models for the structure of the atom based on many experimental evidence , Bohr studied the difficulties...
Theories explaining the covalent bond The concept of the covalent bond developed according to our knowledge about the electron properties , from the theories that are explaining the formation of the covalent bond are...
Animals obtain their requirements of energy in the form of food , after its digestion , the soluble food substances are absorbed , but still remains the problem of their transport and distribution to...
Food is the main source of energy for all living organisms , where green plants make their own food during photosynthesis process from simple substances which are carbon dioxide gas and water , Sunlight...
Light is an essential form of energy , The Sun is the most important source of light energy , It is the main natural source , It gives us heat & light , where...
Light is one of the forms of energy , Light energy is the only form of energy that can be seen , Light energy that can be seen is called the visible spectrum ,...
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