Therefore, the concept of relative mass of an atom was formed. Since an atom is very very tiny, it was not possible to measure atomic mass accurately.The mass of an atom is concentrated in its nucleus and it is due to the protons (p) and neutrons (n) in it.Give some information about two reference atoms. Explain the need for a reference atom for atomic mass. (ii) Compound of metal ‘M’ with radical phosphate.Ĭ. Step – 4: To write down the chemical formula of the compound. Step – 3: To cross multiply as shown by arrows the number of radicals. Step – 2: To write the valency below the respective radical. Step – 1: To write the symbols of the radicals (Basic radicals on the left and acidic radicals on the right)
(i) Compound of metal ‘M’ with radical sulphate Following are the steps to find the chemical formulae of its compounds formed with the radicals, sulphate and phosphate: Write down the steps to find the chemical formulae of its compounds formed with the radicals, sulphate and phosphate. As sodium atom gives away le- and a cation of sodium is formed, hence the valency of sodium is 1 and therefore, the element sodium is monovalent.ī.In chemical reaction, sodium atom has the capacity to give away le_ from its outermost orbit to form Na+ ion with stable electronic configuration (2, 8).Therefore the electronic configuration of sodium atom is (2, 8,1). The number of protons or electrons (atomic number) in Sodium (Na) atom is 11.Explain how the element sodium is monovalent. Write answers to the following questions and explain your answers.Ī.
Step – 4 : To write down the chemical formula of the compound.Ĥ. Step – 3: To cross-multiply as shown by arrows the number of radicals. Na + – Sodium ion, K + – Potassium ion, Ag + – Silver ion Maharashtra State Board Class 9 Science Solutions Chapter 4 Measurement of MatterĬlass 9 Science Chapter 4 Measurement of Matter Textbook Questions and Answers Balbharti Maharashtra State Board Class 9 Science Solutions Chapter 4 Measurement of Matter Notes, Textbook Exercise Important Questions and Answers.
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