Chemistry
Grade-9
Easy
Question
In Mendeleev’s Periodic Table the elements were arranged according to__________.
- Increasing atomic number.
- Decreasing atomic number.
- Increasing atomic masses
- Decreasing atomic masses
Hint:
It is arranged in decreasing atom size.
The correct answer is: Increasing atomic masses
The correct option is c)Increasing atomic masses.
- Mendeleev arranged the elements in ascending order of atomic weight. He said, "The properties of elements are periodic functions of atomic mass."
- This was done so that elements with similar chemical properties would be placed in the same group.
- For this reason, cobalt was placed in front of nickel even though it has a higher atomic mass than nickel.
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