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प्रश्न
An element A has 2 electrons in its fourth shell. State:
position in the periodic table
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उत्तर
Position in the periodic table is group 2 period 4
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संबंधित प्रश्न
The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39, respectively.
- Calculate the average atomic mass of elements A and C.
- Compare the average atomic mass with atomic mass of B.
- What could the elements A, B and C be?
Write any one difference in the electronic configurations of group-1 and group-2 elements ?
In the following set of elements, one element does not belong to the set. Select this element and state why it does not belong:
Oxygen, Nitrogen, Carbon, Chlorine, Fluorine
Fill in the blank in the following statement:
The tendency to gain an electron ............... on moving down in a group of the periodic table.
Why sodium element of group 1 and chlorine element of group 17 both have valency 1?
How do the following change on moving from left to right in a period of the periodic table?
Give examples in support of your answer.
atomic structure (electron arrangements) ?
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. 
The ion of which element will migrate towards the cathode during electrolysis?
What is meant by a group in the periodic table?
Moving down in the second group, number of valence electrons ______.
Which of the following would weigh the least?
(Atomic masses C = 12, 0 = 16, Na = 23)
