Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

how were the positions of cobalt andnickel resolved in the modern periodic table
Asked by shamim.ayanahmad | 14 Mar, 2018, 11:58: PM
answered-by-expert Expert Answer

Mendeleev's Periodic Table was based on the law that the properties of elements are the periodic function of their atomic masses.

So, cobalt with atomic mass 58.93 should be placed after nickel with atomic mass 58.71.

But to maintain similarity in properties, it had to be placed before nickel in Mendeleev's Periodic Table. 

Modern Periodic Table the classification of elements is based on the law that the properties of elements are the periodic function of their atomic numbers.

So, the problem was resolved because cobalt has lower atomic number (27) than that of nickel (28). 

Therefore nickel with atomic number 28 is placed after cobalt with atomic number 27.

 

Answered by Varsha | 15 Mar, 2018, 10:14: AM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 10 - Chemistry
what is elements
Asked by dhumalchhaya13 | 26 May, 2022, 11:05: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
what is periods
Asked by kanchanbalpande82 | 12 Apr, 2022, 11:01: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
what is periods
Asked by kanchanbalpande82 | 12 Apr, 2022, 11:01: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
Modern period table  
Asked by waghmaresheetal78 | 27 Dec, 2021, 05:02: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
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    
question image
Asked by ksheera36 | 03 Jun, 2021, 08:35: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
How tp learn the symbols element
Asked by vungtsaniyanthan | 16 May, 2021, 06:32: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
drawbacks of mendeleev and modern periodic table with example
Asked by sinhagopalakumara | 01 May, 2021, 08:16: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
Que:-How it can be proved that the basic structure of the Modern Periodic Table is based on the electronic configuration of atoms of different elements?
Asked by advssdrall | 26 Mar, 2021, 07:43: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
how does the atomic size vary as you go down a group?
Asked by shettyshrinidhi271 | 07 Jan, 2021, 05:04: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
Just as the way we locate a point on graph as (x, y), can we locate an element as (group number, period)?
Asked by adipadmakarri | 05 Dec, 2020, 06:41: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×