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प्रश्न
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.
उत्तर
The electronic configuration of element A whose atomic number is 20 is 2,8,8,2 and the electronic configuration of element B whose atomic number is 17 is 2,8,7. The molecular formula of the compound formed when element A reacts with element B is AB2. The given compound is CaCl2 formed by the reaction of Ca(OH)2 (strong base) and HCl (strong acid). Since the reaction between a strong acid and a strong base yields a neutral salt so, CaCl2 is neutral.
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संबंधित प्रश्न
List any two properties of the elements belonging to the first group of the modern periodic table.
The correct increasing order of the atomic radii of the elements oxygen, fluorine and nitrogen is:
(a) O, F, N
(b) N, F, O
(c) O, N, F
(d) F, O, N
Name two elements you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
Arrange the following as per the instruction given in the bracket
He,Ar,Ne (Increasing order of the number of electron shells)
Arrange the following as per instruction given in the bracket.
Mg, Cl, Na, S, Si (decreasing order of atomic size)
Moving left to right in the second period, the number of valence electrons _____.
Based on the group valency of element write the molecular formula of the following compound giving justification:
Oxide of first group elements.
The position of certain elements in the Modern Periodic Table is shown below:
Using the above table answer the following questions giving reasons in each case :
(i) Which element will form only covalent compounds?
(ii) Which element is a non-metal with valency 2?
(iii) Which element is a metal with valency 2?
(iv) Out of H, C, and F which has the largest atomic size?
(v) To which family does H, C, and F belong?
What is meant by a Group in the Periodic Table?
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.
