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Solution - Position of Elements and Trends in the Modern Periodic Table

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Question

Write the electronic configuration of K and Ne.

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Given below are some elements of the modern periodic table. Atomic number of the element is given in parentheses.

A(4), B(9), C(14), D(19), E(20)

(a) Select the element that has one electron in the outermost shell. Also, write the electronic configuration of this element.

(b) Which two elements amongst these belong to the same group? Give reasons for your answer.

(c) Which two elements amongst these belong to the same period? Which one of the two has bigger atomic radius?

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Elements in the same group show the same valency. Give scientific reason.

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Based on the group valency of elements state the formula lot the following giving justification for each :-

(i) Oxides of 1st group elements,

(ii) Halides of the elements of group 13, and

(iii) Compounds formed when an element of group 2 combines with, an element of group 16.

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List any two properties of the elements belonging to the first group of the modern periodic table.

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Name any two elements of group one and write their electronic configurations. What similarity do you observe in their electronic configurations? Write the formula of oxide of any of the aforesaid elements.

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Solution for concept: Position of Elements and Trends in the Modern Periodic Table. For the course 9th - 10th SSC (English Medium)
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