19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Lothar Meyer plotted the physical properties such as atomic volume, melting point and ….A…..against atomic weight. Here, A refers to
Lothar Meyer drew a graph showing the relation between
According to Mendeleev, elements are arranged in order of their increasing ……A….Here, A refers to
Mendeleev left the gap under aluminum and a gap under silicon and called these elements Eka-Aluminium and……A……Here, A refers to
Which of the following is incorrect explanation about Mendeleev’s periodic law ?
The basis of modern periodic table is
Physical and chemical properties of elements are determined by
In 1913, Henry Moseley observed regularity in the characteries…A…of the elements. Here, ‘A’ refers to
Atomic number is equal to the…. A…. Here, ‘A’ refers to
The vertical columns in the Periodic Table are termed as
The periods in the Periodic Table are numbered from
Elements whose outer electronic configuration vary from ns2np1 to ns2np6 constitute
In the fourth period of the periodic table, how many elements have one or more 4d electrons?
Which of the following pairs has both members from the same group of periodic table
Without looking at the periodic table, select the elements of IIIA group of the periodic table (atomic numbers are given) :
The transition elements have a characteristic electronic configuration which can be represented as
The element whose electronic configuration is 1s2, 2s2, 2p6, 3s2 is
The electronic configuration of an element is 1s2, 2s22p6, 3s23p3. What is the atomic number of the element which is just below the above element in the periodic table?
The element having electronic configuration [Kr] 4d10, 4f14, 5s2, 5p6, 5d4, 6s2 belongs to
Which of the following represents an excited state of an atom?
An element with atomic number 21 is a
An atom has electronic configuration 1s2, 2s2, 2p6, 3s2, 3p6, 3d3, 4s2, you will place it in
The last element of the p-block in the 6th period is represented by the outermost electronic configuration.
Which of the elements whose atomic numbers are given below, cannot be accommodated in the present set up of the long form of the periodic table?
The electronic configuration of the element which is just above the element with atomic number 43 in the same group is ............