![]() ![]() Which of these have physical and chemical properties resembling calcium ?Ĭompare and contrast the arrangement of elements in Mendeleev’s Periodic Table and the Modern Periodic Table. In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic number 12, 19, 21 and 38. How does the electronic configuration of an atom relate to its position in the Modern Periodic Table ? (d) Which type of ion, cation or anion, will be formed by element A ? (c) Will C be larger or smaller in size than B ? (b) State whether C is more reactive or less reactive than A. The valence shell electronic configuration of these elements is ns 2 np 3. Nitrogen is one of the most electronegative atoms after fluorine ( F) and oxygen ( O ). (a) State whether A is a metal or non-metal. Nitrogen (N): Nitrogen is a p-block element having atomic number 7. ![]() The positions of three elements A, B and C in the periodic table are shown below : (b) To which of the following elements would it be chemically similar ? (Atomic numbers are given in parentheses.) Therefore, a nitrogen atom will have two electrons in the first shell and five in the 2nd shell. (a) What is the atomic number of this element ? That is, the number of electrons in nitrogen is 7. as fluorine have in common ?Īn atom has electronic configuration 2, 8, 7. (b) What property do all elements in the same column of the Periodic Table. ![]() (a)What property do all elements in the same column of the Periodic Table as boron have in common ? (e)twice as many electrons in its second shell as in its first shell ? (d) a total of two shells with three electrons in its valence shell. (c) a total of three shells, with four electrons in its valence shell ? (b) the electronic configuration 2, 8, 2 ? atoms contain a A nitrogen atom, with atomic number 7 and mass number 14. (a) two shells, both of which are completely filled with electrons ? Given the atomic number and mass number, you can work out how many protons. Nitrogen-14 is composed of 7 protons, 7 neutrons, and 7 electrons. Write the electronic configuration of these two elements. X would most likely to be in the same group of the periodic table as Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. (c)The atoms lose their electrons more easily.Įlement X forms a chloride with the formula \( XCl_2, \) which is solid with a high melting point. (b) The number of valence electrons increases. (a) The elements become less metallic in nature. Which of the following statements is not a correct statement about the trends wlien going from left to right across the periods of Periodic Table. NCERT solutions of related questions for Periodic Classification of Elements ![]()
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