The total number of protons and neutrons in the nucleus of the atom is called the atomic mass number. What is meant by atomic mass i number? Explain how the atomic number and mass number of carbon are 6 and 12 respectively.
It means that there is relationship between the valency of an element and the number of electrons in its valence shell. This number ‘one’ matches with the valency of hydrogen which is also one. The electronic configuration of hydrogen shows that there is one electron less than the complete duplet state. H 2, HCl) that valency of hydrogen is one. The molecules formed by combination with hydrogen (E.g. It is confirmed that the valency is zero when electron octet (or duplet) is complete.Ītoms of all the elements except inert gases have tendency to combine with other atoms, i.e. Similarly argon contains eight electrons in the valence shell, i.e. The valence shell of neon is completely filled, i.e. Helium atom contains two electrons, indicates that the outermost shell of helium has an electron duplet. These elements are chemically inert, i.e. Helium and neon, atoms of both these gaseous element do not combine with any other atom. Valence electrons: The electrons in the outermost shell of an atom of an element are called valence electrons. Valency: The capacity of an element to combine with another element is known as valency. What is meant by valency of an element? What is the relationship between the number of valence electron and valency? The positive charge is in the nucleus of the atom. Atom is homogenous sphere of positive charge.Ģ. According to Rutherford’s atomic model the negatively charged electrons revolve around the nucleus.Ģ.
According to Thomson’s atomic model, the negatively charged electrons are embedded in a gel of positive charge.ġ. What is the difference in the atomic models of Thomson and Rutherford?ġ. Maharashtra State Board Class 8 Science Solutions Chapter 5 Inside the AtomĬlass 8 Science Chapter 5 Inside the Atom Textbook Questions and Answers Balbharti Maharashtra State Board Class 8 Science Solutions Chapter 5 Inside the Atom Notes, Textbook Exercise Important Questions and Answers.
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