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प्रश्न
How many elements were known at the time of Mendeleev's classification of elements?
उत्तर
Only 63 elements were discovered at the time of Mendeleev's classification of elements.
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संबंधित प्रश्न
Name three elements that have a single electron in their outermost shells.
Name the Russian chemist who said that the properties of elements are a periodic function of their atomic masses.
State Mendeleev's periodic law.
Write the molecular formula of the oxide of any one of the elements in Mendeleev’s periodic table.
Which two elements show an ambiguity regarding their sequence in Mendeleev’s periodic table?
Write scientific reason.
Mendeleev kept vacant places in the periodic table.
State Mendeleev’s Periodic Law.
On moving from left to right in a period in the periodic table, the size of the atom.
Write the formulae of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeléev.
Properties of the elements are given below. Where would you locate the following elements in the periodic table?
- A soft metal stored under kerosene
- An element with variable (more than one) valency stored under water.
- An element which is tetravalent and forms the basis of organic chemistry
- An element which is an inert gas with atomic number 2
- An element whose thin oxide layer is used to make other elements corrosion resistant by the process of “ anodising”
