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

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ConceptPosition of Elements and Trends in the Modern Periodic Table  

Question

From the following elements :

4Be; 9F; 19K; 20Ca

(i) Select the element having one electron is the outermost shell.

(ii) two elements of the same group.

Write the formula of and mention the nature of the compound formed by the union of 19K and element X(2, 8, 7).

Solution

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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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The position of eight elements in the Modern Periodic Table is given below where atomic numbers of elements are given in the parenthesis.

Period No.

2Li(3)Be(4)
3Na(11)Mg(12)
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5Rb(37)Sr(38)

(i) Write the electronic configuration of Ca.

(ii) Predict the number of valence electrons in Rb.

(iii) What is the number of shells in Sr?

(iv) Predict whether K is a metal or a non – metal.

(v) Which one of these elements has the largest atom in size?

(vi) Arrange Be, Ca, Mg and Rb in the increasing order of the size of their respective atoms.

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Solution for concept: Position of Elements and Trends in the Modern Periodic Table. For the course 8th-10th CBSE
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