Which one of the following is true about metallic character when we move from left to right in a period and top to bottom in a group?

IE₁ and IE₂ of Mg are 179 and 348 kcal mol^-1 respectively. The energy required for the reaction Mg⟶ Mg²⁺ + 2e^- is ___________

The correct order of decreasing electronegativity values among the elements X, Y, Z and A with atomic numbers 4, 8, 7 and 12 respectively __________

Which one of the following is the least electronegative element?

Which one of the following arrangements represent the correct order of least negative to most negative electron gain enthalpy _______________.

In the third period the first ionization potential is of the order.

The number of elements in the first period of the modern periodic table is _____

Characteristic of transition elements is incomplete ____________

Find the incorrect statement.

Elements which generally exhibit multiple oxidation states and whose ions are usually coloured are ___________

On moving diagonally across the periodic table, the second and third period elements show certain similarities. Pick out the pair which shows such a property.

______ is the lightest metal known.

The number of groups in the periodic table ___________

The vertical columns in the periodic table are called as ___________

Match the list I with list II and select the correct answer using the code given below the list.

Law of octaves was proposed by _____

The statement that is not correct for modern classification of element is
(1) The properties of elements are periodic function of these atomic numbers.
(2) The ionisation enthalpy of the elements generally increase with increase in atomic number
(3) For transition elements the 3d orbitals are filled after 3p-orbitals and before 4s orbitals.
(4) Fifth period contain 18 elements.

The first list of 23 chemical elements was published by _____ in the year 1789.

The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called ___________

What would be the IUPAC name for an element with atomic number 222?