Periodic Properties of Elements Test - 3

Magnesium attains stable noble gas configuration after the loss of two electrons. So it has least difference in the values of first and second ionization potential.

The Modern Periodic Law was given by Mosley

Since the value of fourth ionisation energy is very high, so there are three valence electrons in the element.

The electronegativity of Be is the same as Al due to diagonal relationship.

Since difference in atomic numbers between the elements of period 6 and period 7 is 32, hence the atomic number of next inert gas, if discovered, will be 118.

The ionization potential of Na would be numerically the same as the electron affinity of Na⁺

With increase in the atomic number across a period, there is increase in the nuclear charge and hence, decrease in electropositive character.

Since the element contains only two valence electrons, so the value of third ionization energy will be very high.

Electron affinity increases as we move from felt to right along the period in a periodic table.

Smaller the ion, higher will be the hydration enthalpy because smaller atoms can accommodate a large number of water molecules around it, and gets highly hydrated.

Hydration enthalpy decreases down the group because down the group size of the atom increases because of addition of extra valence shell. Therefore, hydration energy will be maximum in case of lithium ion.