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Question
Arrange the following elements in increasing order of their atomic radii:
Li, Be, F, N
Solution
The elements in the increasing order of their atomic radii are as follows:
F<N<Be<Li.
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RELATED QUESTIONS
Study the following table in which positions of six elements A, B, C, D, E and F are shown as they are in the modern periodic table:
|
Group→
Period↓ |
1
|
2
|
3-12
|
13
|
14
|
15
|
16
|
17
|
18
|
| 2 | A | B | C | ||||||
| 3 | D | E | F |
On the basis of the above table, answer the following questions:-
(i) Name the element which forms only covalent compounds.
(ii) Name the element which is a metal with valency three.
(iii) Name the element which is a non-metal with valency three.
(iv) Out of D and E, which is bigger in size and why?
(v) Write the common name for the family to which the elements C and F belong.
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).
Which of the following element would lose an electron easily?
(a) Mg
(b) Na
(c) K
(d) Ca
How does the number of:
valency vary on moving from left to right in the second period of the periodic table?
What is modern periodic law?
Fill in the blank
There are ______ groups and ______ periods in the modern form of periodic table.
Select the correct answer
Identify the metalloid
Copy and complete the following sentence choosing the correct word or words from those given below, at the end of the sentence:
The similarities in the properties of elements belonging to a group are because they have the same ______
With reference to the variation of properties in the Periodic table, which of the following is generally true?
An element A has 2 electrons in its fourth shell. State:
is it an oxidising or reducing agent
