Science Online #Compounds #Atoms #Elements #ChemicalReaction #ChemicalEquations #LawOfConservationOfMatter #LawOfConstantRatios #USA The compound is a substance formed from the combination of atoms of different elements as due to a chemical reaction between them, The chemical equation should be balanced to achieve the law of conservation of matter (mass), the number of atoms of each element in the reactants must equal the number of atoms of the same element in products.
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Science Online #Compounds #Acids #Bases #Alkalis #Oxides #Salts #PeriodicTable #Elements In nature, there is a countless number of existing compounds, Compounds can be classified according to their properties into acids, bases (alkalis), oxides and salts. Acids have an effect on litmus paper which is different from bases because acids change the colour of litmus paper into red, while bases change the colour of litmus paper into blue. You should not touch acids or even bases with your bare hands as they have a corrosive effect on the skin.
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Science Online #Valency #Elements #Periodic_table #Atoms #Metals #Nonmetals #Noble_gases #PeriodicTable #NobleGases #Atomic_groups #Radical #Chemical_formula What is valency? Valency is the number of electrons that an atom gains, loses or even shares during a chemical reaction, The valency of noble gases is zero because their outermost energy level is completely filled with electrons [ have 8 electrons except (He) has 2 electrons], The valency of an element is determined according to the number of electrons in the outermost energy level of its atom.
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Science Online #Atoms #Elements #Chemical_bonds #Ionic_bonds #covalent_bonds #ChemicalBonds #IonicBonds #CovalentBonds Atoms combine with each other forming molecules through chemical bonds, Ionic bond produces compounds molecules only and doesn't produce elements molecules because the ionic bond arises between two different atoms, The covalent bond produces elements molecules because it arises between two atoms for one nonmetallic element, The covalent bond produces compounds molecules because it arises between two atoms for two different nonmetallic elements.
Science Online #Metals #Nonmetals #Inert_gases #Periodic_table #Noble_gases #PeriodicTable #NobleGases #Atoms #InertGases #Elements #Ions Metals are the elements which contain 1 or 2 or 3 elements in the outermost energy level, During the chemical reaction, atoms of metals tend to give their outermost electrons to other atoms to complete their outermost energy level with electrons, the atom becomes a positive ion when it loses an electron or more because the number of positive protons becomes more than the number of negative electrons.