19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The element with lowest electron gain enthalpy is:
Which of the following pairs has almost the same atomic radii?
Assertion: Electron gain enthalpy becomes less negative as we go down a group. Reason: The size of the atom increases on going down the group and the added electron would be farther from the nucleus.
The most ionic compound will be formed between:
Which of the following properties shows a gradual decrease with an increase in atomic number across a period in the periodic table?
Identify the correct order of the size of the following
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…
When a chlorine atom becomes chloride ion, its size
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…
Second electron affinity
The element with the lowest atomic number that has a ground state electronic configuration of (n-1) d6ns2 is located in the
The lower electron affinity of fluorine than that of chlorine is due to
The number of elements present in fifth period of Periodic Table is
An element with lowest ionization energy in their respective period is
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 …
Correct order of radii is
Which one is the correct order of the size of the iodine species.
Which one of the following ions has the highest value of ionic radius?
The electronic configurations of the elements X, Y, Z, and J are given below. Which element has the highest metallic character?
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…
For the second period elements the correct increasing order of first ionization enthalpy is (NEET 2019)
The lUPAC name of an element with atomic number 119 is (NEET 2022)
ns and ns outermost electronic configuration belongs to the
Which of the following oxides is most acidic in nature ? (NEET 2018)
The period number in the long form of the periodic table is equal to