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Question
Define the term : Atomic size
Solution
Atomic size:-
Atomic size or atomic radius is the distance between the centre of the nucleus and the outermost shell of an isolated atom.
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RELATED QUESTIONS
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?
Write the number of periods the Modern Periodic Table has. State the changes in valency and metallic character of elements as we move from left to right in a period. Also state the changes, if any, in the valency and atomic size of elements as we move down a group.
How do electronic configurations of elements change in second period of periodic table with increase in atomic numbers?
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Give example in support of your answer.
For each of the following triads, name the element with the characteristics specified below:
| Elements | Least atomic radius | Chemically least reactive |
| (i) F, Cl, Br (ii) Li, Na, K |
.................... .................... |
.................... .................... |
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The element which has the maximum number of valence electrons is:
(a) Na
(b) P
(c) Si
(d) A
An element X belong to 3rd periods and group II of the periodic table state:
name of the element,
Study the extract of the Periodic Table given below and answer the questions that follow. Give the alphabet corresponding to the element in question. DO NOT repeat an element. 
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The electronic configuration of an element is 2, 8, 4. State it:
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