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Question
Select the correct answer from the options given below.
It is a metal in period 2 having electronic configuration 2, 1?
Options
Beryllium
Lithium
Sodium
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Solution
Lithium
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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.
The electrons in the atoms of four elements A, B, C and D are distributed in three shells having 1, 3, 5 and 7 electrons in the outermost shell respectively. State the period in which these elements can be placed in the modern periodic table. Write the electronic configuration of the atoms of A and D and the molecular formula of the compound formed when A and D combine.
Differentiate between Normal elements and Transition elements.
What happens to the metallic character of the elements as we move from left to right in a period of the periodic table?
In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group ?
Which of the following set of elements is written correctly in the order of their increasing metallic character?
(a) Mg, Al, Si
(b) C, O, N
(c) Na, Li, K
(d) Be, Mg, Ca
An element X belong to 3rd periods and group II of the periodic table state:
name of the element,
Fill in the blank
Oxidising property ________from fluroine to iodine because the power to accpet electron decreases.
Name and state the following with reference to the elements of the first three periods of the periodic table.
Metalloid in Period 3.
Answer the following question:
State the four blocks of the modern periodic table based on the electronic configuration of elements.
