How many elements were known at the time of Mendeleev's classific… - Vidyadip

Question

How many elements were known at the time of Mendeleev's classification of elements?

✓

Answer

Only 63 elements were discovered at the time of Mendeleev's classification of elements.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[1 Mark Question Answer]" from The Periodic Table→The Periodic Table — all question types→CHEMISTRY STD 9 question papers→ICSE Board STD 9 question papers→ICSE Board question paper generator→

Similar questions

Write a balanced equation for the reaction named metal with (i) boiling water (ii) steam.

Write the chemical equation for the following word equation and balance them.
Calcium oxide + Carbon dioxide→Calcium carbonate

Select the basic and acidic radicals in the following compounds.
$MgSO_4$

Write the balanced chemical equation of the following reaction.
aluminiumsulphate+sodium hydroxide → sodiumsulphate+sodium metaaluminate+water.

Hydrogen can be prepared with the metal zinc by using:
acid
Give an equation.

What do you understand by the following terms?
super-saturated solution

Name or state the following:

Ion formed by the gain of an electron(s)

What is the effect of the following pollutants on living beings?
Mercury compounds

Write the chemical reaction where the following changes are observed.
Precipitate is formed

From the symbol ${ }_2^4 \mathrm{He}$ for the element helium, write down the mass number and the atomic number of the element.