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Explanation:
1.Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell.
As magnesium has 2 valence electron, its valency is 2. Accordingly, the valency of chlorine is 7-8 which is -1. Thus the valency of Mg is 2, whereas for chlorine it is -1 in MgCl2.
2.A potassium atom, K is in its normal elemental state with 1 valence electron in it's most outer shell. It also has an equal amount of electrons and protons- 19 of each. However the potassium ion has lost it's valence electron and has therefore formed a positive action, K+.
Answer:
the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
Explanation: