19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
When a chlorine atom becomes chloride ion, its size
The number of elements present in fifth period of Periodic Table is
Which of the following pairs has almost the same atomic radii?
The last element of the p-block in the 6th period is represented by the outermost electronic configuration.
The element with atomic number 57 belongs to
The electronic configuration of the element which is just above the element with atomic number 43 in the same group is ............
The element with the lowest atomic number that has a ground state electronic configuration of (n-1) d6ns2 is located in the
Identify the correct order of the size of the following
The elements with atomic numbers 9, 17, 35, 53, 85 are all
Molybdenum metal is related to which block?
The transition elements have a characteristic electronic configuration which can be represented as
Which one of the following pair of elements has similar properties?
Which of the following is not a Dobereiner’s triad?
Elements whose outer electronic configuration vary from ns2np1 to ns2np6 constitute
ns and ns outermost electronic configuration belongs to the
Which one of the following ions has the highest value of ionic radius?
The correct order of second ionization potential of C, N, O and F is
Which of the following isoelectronic ions has the lowest ionization energy?
Identify the incorrect match. (NEET 2020) Name IUPAC Official Name
Which of these have no unit?
The element with lowest electron gain enthalpy is:
The most ionic compound will be formed between:
Assertion: Third ionization energy of sulphur is larger than phosphorous. Reason: There is a larger amount of stability associated with filled s- and p- sub-shells (a noble gas electron configuration) which correspond…
Assertion: Generally, ionization enthalpy increases from left to right in a period. Reason: When successive electrons are added to the orbitals in the same principal quantum level, the shielding effect of the inner co…
Which of the following properties shows a gradual decrease with an increase in atomic number across a period in the periodic table?