This is a sample scrolling text that has scrolls texts to left. This is a sample scrolling text that has scrolls texts to left.
S – Block Elements


While group two, or the metals of alkaline earth, are S-block elements with two electrons in their s-orbitals, group one, or alkali metals, are S-block elements with just one electron in their s-orbital. In an ascending sequence of energy, the electrons in an atom occupy a number of sub-orbitals of the possible energy levels. The s, p, d, or f subshells can hold an atom’s last electron. As a result, the elements of an atom whose final valence electron is located in the s-suborbital are referred to as s-block elements.

S-Block Elements’ Electronic Configuration

The uppermost shell of the s-block alkali elements only contains one valence electron. Due to the outermost electron’s slack holding, these metals are very electropositive. As a result, they cannot be found in nature in a free condition and cannot be found in nature in a free condition as a result.

S-Block Elements Characteristics

Within each group of elements, the characteristics of alkali and alkaline earth elements show a predictable gradient. Lithium and Beryllium, the first members of both S block elements, differ significantly from their other members while also bearing a strong resemblance to the diagonal element found in the following column.

These S-block elements are anomalous for the following reasons:

  1. very small atomic and ionic sizes
  2. Higher charge density (charge/atom volume)
  3. heightened polarization
  4. There are no d-orbitals.

The initial s block element becomes more covalent with increased polarization, setting it apart from the other ionic s block members. They are similar in size and charge density to the element diagonally positioned in the following group. It is observed that the physical and chemical properties of these S-block elements change in a certain pattern when the atomic number of the elements increases.

Chemical Characteristics of S-Block Elements

Atomic and ionic Radii- When the current periodic table’s block elements are inspected, it can be noticed that the alkali metals are larger than other elements in a given period. The total number of electrons rises along with the number of shells as the atomic number rises.

Ionization Enthalpy- The size of the atoms grows as we move down the group, which causes a decrease in the nucleus’s attraction to the electrons in the outermost shell. Ionization enthalpy goes down as a result. In comparison to other elements, the ionization enthalpy of alkali metals is somewhat lower.

Hydration Enthalpy- decreases as the components’ ionic sizes increase. Because the atom can hold more water molecules around it due to the high charge/radius ratio, the hydration enthalpy increases as the size of the ion decreases. The ion thus becomes hydrated.

Relationships between opposites in s block elements

Between adjacent s-block elements, which are found in the second and third periods of the periodic table, there is a diagonal link. For instance, the properties of magnesium, which are found in the second group and third period, are comparable to those of lithium, which is found in group 1A and the second period. Similar similarities may be seen between the properties of beryllium, which are found in the second group and second periods, and those of aluminum, which are found in the third period and third group. The two items are referred to as diagonal pairs or diagonal neighbors if their attributes are similar.

Magnesium and lithium share certain similarities

Elemental ethanol has the ability to dissolve lithium and magnesium chlorides. They are lighter than the other elements in their groupings. Lithium and magnesium each produce their own nitrides in the presence of nitrogen. When lithium and magnesium combine with too much oxygen, no superoxides are produced.

Beryllium and aluminum share similarities

With too much alkali, aluminum hydroxide and beryllium hydroxide transform into the corresponding ions. Due to the existence of an oxide film on the metal’s surface, each of these elements may withstand an acid attack. The chlorides of each of these metals can dissolve in organic solvents.

Important topics like S-block elements are included in the notes offered bytop NEET coaching in Bangalore and Hyderabad for all subjects. To pass tEvery student must be able to understand these important topics in order to succeed on the NEET exams. Students are guided through every step by DR Academy so they can achieve their doctoral goals. They offer practice exams and question papers from prior years so that students can get used to the pressure and not feel pressured during the exam.