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प्रश्न
State the following:
The group to which the element with an electronic configuration of 2, 8, 2 belongs.
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उत्तर
Element [2, 8, 2] belongs to group 2 or [II – A]
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संबंधित प्रश्न
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.
The elements 4Be, 12Mg and 20Ca, each having two valence electrons in their valence shells, are in periods 2, 3 and 4 respectively of the modern periodic table. Answer the following questions associated with these elements, giving reason in each case:
(a) In which group should they be?
(b) Which one of them is least reactive?
(c) Which one of them has the largest atomic size?
How do the atomic size and metallic character of elements vary as we move :-
(a) down a group and
(b) from left to right in a period
Name the element of lower nuclear charge out of Be and Mg.
name the elements in period 1.
Four elements P, Q, R and S belong to the third period of the Modern Periodic Table and have respectively 1, 3, 5 and 7 electrons in their outermost shells. Write the electronic configurations of Q and R and determine their valences. Write the molecular formula of the compound formed when P and S combine.
An element 'M' has atomic number 12.
(a) Write its electronic configuration.
(b) State the group to which 'M' belongs.
(c) Is 'M' a metal or a non-metal.
(d) Write the formula of its chloride.
Fill in the blank
There are ______ groups and ______ periods in the modern form of periodic table.
Name and state the following with reference to the elements of the first three periods of the periodic table.
Alkaline earth metal in period 3.
State the nature of compounds formed when group 17 elements combine with (i) metals (ii) non-metals.
