What is sp Hybridisation?

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Grade Level:

Class 12

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Definition

What is it?

sp hybridisation is a mixing of one 's' atomic orbital and one 'p' atomic orbital from the same atom to form two new, identical hybrid orbitals. These new hybrid orbitals are called 'sp' hybrid orbitals and point in opposite directions, creating a linear shape.

Simple Example

Quick Example

Imagine you have one ladoo (representing an 's' orbital) and one jalebi (representing a 'p' orbital). When you mix them perfectly in a blender, you don't get a ladoo or a jalebi anymore. Instead, you get two identical, new sweet dishes (representing 'sp' hybrid orbitals), both having a bit of ladoo and jalebi flavour. These two new dishes are also arranged in a straight line, like two snacks on a skewer.

Worked Example

Step-by-Step

Let's consider the formation of beryllium chloride (BeCl2) molecule to understand sp hybridisation. --- Step 1: Identify the central atom. In BeCl2, Beryllium (Be) is the central atom. Its atomic number is 4, so its electronic configuration is 1s^2 2s^2. --- Step 2: Consider the excited state. For bonding, one electron from the 2s orbital is promoted to the empty 2p orbital. So, Be's excited state configuration is 1s^2 2s^1 2p^1. --- Step 3: Mix the orbitals. One 2s orbital and one 2p orbital from Beryllium mix together. --- Step 4: Form hybrid orbitals. This mixing forms two new, identical sp hybrid orbitals. --- Step 5: Arrange the hybrid orbitals. These two sp hybrid orbitals orient themselves at 180 degrees to minimize repulsion, giving a linear geometry. --- Step 6: Form bonds. Each sp hybrid orbital overlaps with a p orbital from a Chlorine atom to form two Be-Cl sigma bonds. --- Answer: Beryllium in BeCl2 undergoes sp hybridisation, resulting in a linear molecular geometry.

Why It Matters

Understanding hybridisation helps scientists predict the shapes of molecules, which is crucial in fields like medicine for designing new drugs or in biotechnology for understanding protein structures. Engineers use this knowledge to develop new materials with specific properties, like stronger plastics or more efficient solar cells.

Common Mistakes

MISTAKE: Thinking that sp hybridisation involves mixing all p orbitals. | CORRECTION: Only one s orbital and one p orbital mix in sp hybridisation, specifically forming two sp hybrid orbitals.

MISTAKE: Believing that hybridisation changes the number of orbitals. | CORRECTION: Hybridisation only rearranges existing orbitals into new, equivalent hybrid orbitals. The total number of orbitals remains the same (e.g., one s + one p = two sp).

MISTAKE: Confusing hybridisation with bond formation. | CORRECTION: Hybridisation is the mixing of atomic orbitals BEFORE bond formation. It prepares the atom for bonding by creating suitable orbitals for overlap.

Practice Questions

Try It Yourself

QUESTION: How many sp hybrid orbitals are formed when one s and one p orbital mix? | ANSWER: Two

QUESTION: What is the bond angle in a molecule that undergoes sp hybridisation? | ANSWER: 180 degrees

QUESTION: If a central atom has one s orbital and one p orbital involved in hybridisation, what is the resulting shape of the molecule? | ANSWER: Linear

MCQ

Quick Quiz

Which of the following molecules exhibits sp hybridisation?

Methane (CH4)

Water (H2O)

Ethyne (C2H2)

Ammonia (NH3)

The Correct Answer Is:

In Ethyne (C2H2), each carbon atom forms one sigma bond with hydrogen and one sigma bond with the other carbon, along with two pi bonds. This requires two hybrid orbitals, which are formed by sp hybridisation. The other options involve sp3 or sp2 hybridisation.

Real World Connection

In the Real World

Imagine the strong, lightweight carbon fibers used in high-performance bicycles or even some parts of ISRO rockets. The carbon atoms within these materials often form strong, stable structures due to specific types of hybridisation, including sp. Understanding these molecular shapes is vital for creating such advanced materials.

Key Vocabulary

Key Terms

ORBITAL: A region around the nucleus where an electron is most likely to be found | HYBRIDISATION: The mixing of atomic orbitals to form new, identical hybrid orbitals | LINEAR GEOMETRY: A molecular shape where atoms are arranged in a straight line, with a 180-degree bond angle | SIGMA BOND: A strong single covalent bond formed by direct overlap of atomic orbitals

What's Next

What to Learn Next

Great job understanding sp hybridisation! Next, you should explore 'sp2 Hybridisation'. It builds on what you've learned here, showing how mixing different numbers of orbitals leads to different molecular shapes and properties, just like adding more ingredients can change a dish!