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The first three elements of Group 1 have the following atomic structures (a) Lithium : 3p, 4n, 2, 1 electrons (b) Sodium: 11p, 12n, 2, 8, 1 electrons (c) Potassium: 19p, 20n, 2, 8, 8, 1 electrons which of the following features causes them to have similar properties?

(a) What is a group in the periodic table? In which part of a group would you separately expect elements to have (i) the greatest metallic character (ii) the largest atomic size? (b) In what respects do the properties of group 1 elements differ from those of group 17 elements? Explain with examples by taking one element from each group. (c) From the standpoint of atomic structure, what determines which element will be the first and which the last in a period of the periodic table? (d) Explain why, the properties of elements are repeated after 2,8,18 and 32 elements in the periodic table.

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