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CHEMISTRY, CHAPTER 2, CHEMICAL BONDING, 1: The attractive force that holds together the atoms in a molecule is known, as, Answer: Chemical bonding, 2: Which of the following elements have attained stability. Justify your, answer., Oxygen (Z=8), Argon (Z=18), Calcium (Z=20), Neon (Z=10), Answer:, Argon(Z=18), Neon (Z=10), The electronic configuration of argon is 2, 8, 8 . In neon it is 2, 8 In both, elements the outermost shell contains 8 electron each .They attained octet, configuration., 3: Given below are the electronic configurations of certain elements., (Symbols are not real), , A - 2,8,2, B - 2,8,7, C - 2,8,6, D - 2,8,8, E - 2,8,1, a) Which one of these is the most stable element ?, b) Which among these donate electrons during bond formation ?, c) Identify the elements which accept electrons during reactions ?, d)Which of these elements are metals?, Answer:

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a) D, b) A, E, c) B, C, d) A, E, 4:, Ne - 2, Ar - 2,, 8, 8, 8, , Kr - 2, 8,, 18, 8, , The given elements do not take part in chemical reactions usually. Why?, Answer:, There are 8 electrons in the outermost shell of their atoms (Octet Electron, Configuration)., 5: Define ionic bonding?, Answer:, The chemical bond formed by the electron transfer., 6: When sodium and Chlorine take part in bond formation ,they attain, octet configuration by electron transfer. (Atomic number : Na = 11, Cl =, 17 ), Represent the Electron dot diagram of the above bond formation, Answer:, ., , 8: Positive ions are called ------ --., Answer: cations, 9: Negative ions are called----- --., Answer: anions