Group→12131415161718Period3XBCDE4Y5ZRefer the above part of periodic

1.	Group→12131415161718Period3XBCDE4Y5ZRefer the above part of periodic table and answer the following questions. a) Element with the least atomic size. b) Write the electronic configuration of the elements B and E. c) Identify the elements that have similar physical and chemical properties as the element Y. d) Arranged elements increasing order of their electronegativity values.
Answer» a) The element with least atomic size is E. Because when we move from left to right in a period the atomic size decreases, b) Electronic configuration of B is 1s² 2s² 2p⁶ 3s² 3p¹ Because the element belongs to 13th group its general configuration is ns² np¹ and the element belongs to third period and its atomic number is 13. Similarly electronic configuration of E is 1s² 2s² 2p⁶ 3s² 3p¹. Because the element belongs to 16th group. Its general configuration is ns2np4 and it is in third period. So its atomic number is 16. c) The elements which have similar physical and chemical properties with Y are X and Z. Because they lie in a single group, i.e. 1st group. In a group, elements are having similar physical and chemical properties. d) Z < Y < X < B < C < D < E.

Group→12131415161718Period3XBCDE4Y5ZRefer the above part of periodic table and answer the following questions. a) Element with the least atomic size. b) Write the electronic configuration of the elements B and E. c) Identify the elements that have similar physical and chemical properties as the element Y. d) Arranged elements increasing order of their electronegativity values.

Answer»

a) The element with least atomic size is E. Because when we move from left to right in a period the atomic size decreases,

b) Electronic configuration of B is 1s² 2s² 2p⁶ 3s² 3p¹ Because the element belongs to 13th group its general configuration is ns² np¹ and the element belongs to third period and its atomic number is 13. Similarly electronic configuration of E is 1s² 2s² 2p⁶ 3s² 3p¹. Because the element belongs to 16th group. Its general configuration is ns2np4 and it is in third period. So its atomic number is 16.

c) The elements which have similar physical and chemical properties with Y are X and Z. Because they lie in a single group, i.e. 1st group. In a group, elements are having similar physical and chemical properties.

d) Z < Y < X < B < C < D < E.

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