Sudgen believes differently than sidgwick. According to him maximum no of electrons in valency orbit cannot exceeds eight. There he introduced a new union where one electron is shared between two atoms, which he termed as singlet linkage or simplysinglet. He also named it single electron linkage or half bond.

Sugden Singlet Linkage Theory
The Sugden Singlet Linkage Theory is a concept in economics proposed by philosopher and economist Robert Sugden. This theory focuses on the idea that people's preferences are not fixed, but can be influenced by the context in which choices are made.

Key Points:
- Contextual Influence: The theory suggests that individual preferences can be influenced by the way choices are presented or framed.
- Linkage: Sugden argues that preferences are "linked" to the context in which they are formed, rather than being independent of it.
- Single-Peakedness: The theory also incorporates the idea of "single-peaked" preferences, meaning that individuals have a peak preference for a certain option, with preferences decreasing as they move away from this peak.

Implications:
- The Sugden Singlet Linkage Theory has implications for various areas of economics, such as behavioral economics and public policy.
- Understanding how preferences are influenced by context can help policymakers design more effective interventions.
- By recognizing the impact of framing on decision-making, economists can better predict and explain individual choices.
In conclusion, the Sugden Singlet Linkage Theory highlights the dynamic nature of preferences and the importance of considering context in economic decision-making. This theory offers valuable insights into human behavior and can inform the development of more nuanced economic models and policies.