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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 numbers of three elements A, B and C are 12, 18 and 20 respectively. State, giving reason, which two elements will show similar properties.
The elements Be, Mg and Ca each having two electrons in their outermost shells are in periods 2, 3, and 4 respectively of the modern periodic table. Answer the following questions, giving justification in each case:-
(i) Write the group to which these elements belong.
(ii) Name the least reactive element.
(iii) Name the element having largest atomic radius.
Name the element that has two shells, both of which are completely filled with electrons.
State one reason for keeping fluorine and chlorine in the same of the periodic table.
Correct the statements.
Elements in the same periods have equal valency.
Fill in the blank
Most electropositive elements belong to ______ group.
Name the elements in period 1.
The elements of one short period of the periodic table are given below in order from left to right:
| Li | Be | B | C | O | F | Ne |
One element of this period is missing. Which is the missing element and where should it be placed?
Name or state following with reference to the element of the first three periods of the periodic table.
The non-metallic element present in period 3 other than sulphur and chlorine.
Name or state following with reference to the element of the first three periods of the periodic table.
A non-metal in period 2 which is tetravalent.
