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CBSE Class 10 Answered

1. Electronic configuration of an element ‘x’ is 2.8.1 and for ‘Y’ 2.8.7 then mention the bond existing between 2 elements. a) Covalent bond b) Ionic bond c) Hydrogen bond d) Metallic bond 2. Identify the element in a 2nd period and 14th group with valency 4. a) Carbon –C b) Silicon – Si c) Boron – B d) Fluorine – F 3. Modern periodic law state that “the properties of elements are the periodic function of their ___________. a) Atomic number b) Atomic mass c) Valiancy d) Atomic radius.   Name the group of hydrogen.   9. In a Modern periodic table how the ionization energy, metallic nature and atomic radius vary? 10. 6 C 12 , 20Ca40 , 21SC45 Write the Electronic configuration of given elements and mention the group period and block    
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Asked by ksheera36 | 03 Jun, 2021, 08:35: PM
answered-by-expert Expert Answer
1. Electronic configuration of Element X is 2,8,1 and Y is 2,8,7
 
Element X needs to release one electron to attain stability. After releasing one electron, it has 8 electrons in outermost shell(complete octet). From this electronic configuration we can say X is Metal.
 
Similarly, Y needs to gain one electron to attain stability. After gaining one electron, It has 8 electrons in outermost shell(compolete octet). From this we can say that this element is non-metal.
 
 
Bonding between metal and non-metal is Ionic bond.
Answered by Ravi | 04 Jun, 2021, 09:13: PM

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