The main reason for the stability of the noble gas elements is the completely filled orbits of the atom.Įach and every element in the periodic table wants to attain the stability of noble gas as they are the most stable element in the periodic table.
As all the orbits of an atom are filled, the new electrons, if added, need a new orbit. These are at the rightmost column of the periodic table. These are named as the Noble Gas family or the inert gas. If every orbit in the atom is completely filled with its maximum number of electrons that it can hold then such atoms are the most stable elements. The group number defines the valence electrons present in the element. They are the electrons responsible for bonding, which. The period number represents the number of shells in an atom. Let students know that these electrons in the outermost energy level are called valence electrons. By using the electron configuration (condensed notation) of an element, all the electrons outside of the nobel gas core represent the valence electrons. Explain the long form of the periodic table.The alkaline metals, the second group of the table, contains two valence electrons, i.e., the outermost orbit of this atom contains two electrons.Which one of the following elements found a place in the periodic table later?GermaniumChlorineOxygenSilicon In Mendeleev’s periodic table, gaps were left for the elements to be discovered later.How does the number of valence electrons vary on moving from left to right:(i) In the first period of the periodic table? (ii) In the second period of the periodic table?.Consider the following elements:Na, Ca, Al, K, Mg, Li (a) Which of these elements belong to the same period of the periodic table? (b) Which of these elements belong to the same group of the periodic table?.(a) What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?(b) What is the number of elements in: (a) 1st period, and (b) 3rd period, of the modern periodic table?.Define the Periodic Table with elements name.Atomic number of a few elements are given below 10, 20, 7, 14(a) Identify the elements(b) Identify the Group number of these elements in the Periodic Table(c) Identify the Periods of these elements in the Periodic Table(d) What would be the electronic configuration for each of these elements?(e) Determine the valency of these elements.(a) What is the usual number of valence electrons and valency of group 18 elements of the periodic table?(b) What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?.(a) How does the electropositive character of elements change on going down in a group of the periodic table?(b) State how the valency of elements varies (i) in a group, and (ii) in a period, of the periodic table.In the modern periodic table, which are the metals among the first ten elements?.Compare and contrast the arrangement of elements in Mendeleev’s Periodic Table and the Modern Periodic Table.What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?.Name of 118 elements in the periodic table.How does the valency of elements change on moving from left to right in the third period of the periodic table?.How does the valency of elements vary in going down a group of the periodic table?.
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