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प्रश्न
Select the correct answer
Number of shells in potassium are
पर्याय
3
2
4
5
उत्तर
4
APPEARS IN
संबंधित प्रश्न
From the following elements :
4Be; 9F; 19K; 20Ca
(i) Select the element having one electron is the outermost shell.
(ii) two elements of the same group.
Write the formula of and mention the nature of the compound formed by the union of 19K and element X(2, 8, 7).
Write any one difference in the electronic configurations of group-1 and group-2 elements ?
What happens to the metallic character of the elements as we go down in a group of the periodic table?
An element X belong to 3rd periods and group II of the periodic table state:
the valency,
Fill in the blank
Most electropositive elements belong to ______ group.
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
(a) To which period do these elements belong?
(b) One element of this period is missing. Which is the missing element and where should it be placed?
(c) Place the three elements, fluorine, beryllium and nitrogen, in the order of increasing electro negativity.
(d) Which one of the above elements belongs to the halogen series?
Write the electronic configuration of two elements A and B whose atomic numbers are 20 and 17 respectively. Write the molecular formula of the compound formed when element A reacts with element B. State whether this compound is acidic, basic or neutral. Give a reason to justify your answer.
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 covalent compound formed between an element in period 1 and a halogen.
Name or state following with reference to the element of the first three periods of the periodic table.
A metal in period 3 having valency 3.
