19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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 whose electronic configuration is 1s2, 2s2, 2p6, 3s2 is
The transition elements have a characteristic electronic configuration which can be represented as
Without looking at the periodic table, select the elements of IIIA group of the periodic table (atomic numbers are given) :
Which of the following pairs has both members from the same group of periodic table
In the fourth period of the periodic table, how many elements have one or more 4d electrons?
Elements whose outer electronic configuration vary from ns2np1 to ns2np6 constitute
The periods in the Periodic Table are numbered from
The vertical columns in the Periodic Table are termed as
Atomic number is equal to the…. A…. Here, ‘A’ refers to
The ionization energy will be maximum for
The most ionic compound will be formed between:
The element with lowest electron gain enthalpy is:
The element with highest I.E. is:
Consider the following statements: (I) The radius of an anion is larger than that of the parent atom. (II) The ionization energy generally increases with the increasing atomic number in a period. (III) The electronega…
A, B, and C are hydroxy-compounds of the elements X, Y, and Z respectively. X, Y, and Z are in the same period of the periodic table. A gives an aqueous solution of pH less than seven. B reacts with both strong acids …
The lower electron affinity of fluorine than that of chlorine is due to
Second electron affinity
An element with lowest ionization energy in their respective period is
The ionization energy of boron is less than that of beryllium because :
The electronic configurations of the elements X, Y, Z, and J are given below. Which element has the highest metallic character?
From which of the following species it is easiest to remove one electron?
For a given value of n (principal quantum number), ionization energy is highest for
IE1 and IE2 of Mg(g) are 178 and 348 kcal mol–1 respectively. The energy required for the reaction Mg (g) ® Mg2+ (g) + 2e– is
Which of the following isoelectronic ions has the lowest ionization energy?