The nuclear charge of Li is:
Which of the following is one of the major drawbacks of Mendeleev's periodic table?
With an increase in temperature by 10k, the rate of reaction becomes double. How many times the rate of reaction will be if the temperature is increased from 303 k to 353 k?
Name the element that first shows some visible metallic properties at room temperature.
The properties of_________were predicted by Mendeleev before their isolation.
The number of elements known in Mendeleev's presented periodic table is:
The law of triads is not applicable to:
Lanthanides belong to which period?
In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.69 amu. Reason for the same is that:
The law of triads was given by:
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.
Mendeleev examined the relationship between_________and______for classification of elements.
Pair of element shaving same number of valence electrons is:
How many periods were there in Mendeleev's periodic table?
What were the limitations of Mendeleev's periodic table?
Position of Hydrogen => Position of hydrogen in the periodic table is Uncertain Because hydrogen is placed in 1 A group with Alkali metals.
Position of isotopes => isotopes haven't been given separate place in periodic table.
Cause of periodicity => Mendeleev could not explain the cause of periodicity.
Separation of similar elements => some dissimilar elements have been placed together