Class 10SciencePeriodic Classification of ElementsMix Examples - Periodic Classification of Elements
EasyWrite true or false for the statement: In order to fit elements into his table,Newlands adjusted three elements in the same slot,but also put some unlike elements in the same slot.
(B) The statement is False. In Newlands' Law of Octaves,he adjusted two elements in the same slot (e.g.,cobalt and nickel) to fit elements into his table,but he did not put three elements in the same slot. Furthermore,he did place some unlike elements in the same slot,but the claim regarding 'three elements' is incorrect.
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Similar Questions
Which of the following gives the correct increasing order of the atomic radii of $O$,$F$ and $N$?
Medium
View Solution$(a)$ Name the element with atomic number $17$.
$(b)$ To which period does it belong?
$(c)$ To which group does it belong?
$(d)$ Write its electronic configuration.
$(b)$ To which period does it belong?
$(c)$ To which group does it belong?
$(d)$ Write its electronic configuration.
Medium
View SolutionCan the following groups of elements be classified as Dobereiner's triad?
$(a)$ $Na, Si, Cl$
$(b)$ $Be, Mg, Ca$
Atomic mass of $Be = 9, Na = 23, Mg = 24, Si = 28, Cl = 35, Ca = 40$. Explain by giving reasons.
$(a)$ $Na, Si, Cl$
$(b)$ $Be, Mg, Ca$
Atomic mass of $Be = 9, Na = 23, Mg = 24, Si = 28, Cl = 35, Ca = 40$. Explain by giving reasons.
Medium
View SolutionState the Modern Periodic Law.
Easy
View SolutionTwo elements $M$ and $N$ belong to group $I$ and $II$ respectively and are in the same period of the periodic table. How do the following properties of $M$ and $N$ vary:
$(a)$ sizes of their atoms?
$(b)$ their metallic characters?
$(c)$ their valencies in forming oxides?
$(d)$ formulae of their chlorides?
$(a)$ sizes of their atoms?
$(b)$ their metallic characters?
$(c)$ their valencies in forming oxides?
$(d)$ formulae of their chlorides?
Medium
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