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प्रश्न
Supply the missing word from those in bracket:
If an element has one electron in its outermost energy level [shell] then it is likely to be _______.
विकल्प
metallic
non- metallic
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उत्तर
If an element has one electron in its outermost energy level [shell] then it is likely to be metallic.
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संबंधित प्रश्न
Two elements ‘A’ and ‘B’ belong to the 3rd period of Modern periodic table and are in group 2 and 13, respectively. Compare their following characteristics in tabular form:-
(a) Number of electrons in their atoms
(b) Size of their atoms
(c) Their tendencies to lose electrons
(d) The formula of their oxides
(e) Their metallic character
(f) The formula of their chlorides
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.
How do atomic structures (electron arrangements) change in a period with increase in atomic numbers from left to right?
Why do elements in the same group show similar properties but the elements in different groups show different properties?
Why are noble gases placed in a separate group?
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.
Select the correct answer
Number of shells in potassium are
Select the correct answer
Identify the metalloid
Answer the following question:
State the four blocks of the modern periodic table based on the electronic configuration of elements.
Name the period which is the shortest period of the periodic table.
