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प्रश्न
Select the correct answer
Number of shells in potassium are
विकल्प
3
2
4
5
उत्तर
4
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संबंधित प्रश्न
Na, Mg and Al are the elements of the same period of Modern Periodic Table having, one, two and three valence electrons respectively. Which of these elements (i) has the largest atomic radius, (ii) is least reactive? Justify your answer stating reason for each case.
Define the term : Valency
Which element has a total of two shells, with three electrons in its valence shell?
Why does the size of the atoms progressively become smaller when we move from sodium (Na) to chlorine (Cl) in the third period of the periodic table?
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.
Chemical reactivity of elements ?
An element 'X' (Atomic number – 20) burns in the presence of oxygen to form a basic oxide.
(a) Identify the element and write its electronic configuration.
(b) State its group number and period number in the Modern Periodic Table.
(c) Write a balanced chemical equation for the reaction when this oxide is dissolved in water.
Calculate the valency of element X whose atomic number is 9.
How many groups and periods are there in the modern periodic table?
What is the common feature of electronic configurations of the elements at the end of period 2 and period 3?
Moving left to right in the second period, the number of valence electrons _____.
