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प्रश्न
What is the common feature of the electronic configuration of the elements at the end of Period 2 and Period 3?
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उत्तर
The elements at the end of the period have 8 electrons in the valence shell.
Ne = 2, 8
Ar = 2, 8, 8
संबंधित प्रश्न
Write the electronic configuration of K and Ne.
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.
In the following set of element, one element does not belong to the set. Select this element and state why it does not belong:
Calcium, Magnesium, Sodium, Beryllium
Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change?
Fill in the blank:
on moving from right to left in the second period, the number of valence electrons……….
State whether the following statement is true or false
Similar electronic configuration is repeated after intervals of 2, 8, 8, 18 and 32.
Select the correct answer
Most reactive character among the elements given below is found in
(a) Fill in the blanks and rewrite the completed statements:
(i) ________ group in the periodic table contains elements that are all gases at room temperature.
(ii) Very fine particles mainly scatter ______ light.
Fill in the blank and rewrite the completed statement:
________ group in the periodic table contains elements that are all gases at room temperature.
Select the correct answer from the options given below.
It is a period having elements from atomic no. 11 to 18.
