BLG 143 Chapter Notes - Chapter 2: Electron Shell, Hydrogen Bond, Atomic Nucleus

• School: Ryerson University
• Department: Biology
• Course: BLG 143
• Professor: Vadim Bostan

Document Summary

2. 1 atoms, ions and molecules: the building blocks of. Chemical evolution: the focus on structure follows from one of the most central themes in biology: structure affects function. Isotopes have different masses: neutrons and protons are measured in daltons(da, to understand how the atoms involved in chemical evolution behave, focus on how electron are arranged around the nucleus: Electrons move around atomic nuclei i specific regions called orbitals. Each orbital can hold up to two electrons. Orbitals are grouped into levels called electron shells. Electron shells are numbered 1, 2, 3, and so on to indicated their relative distance from the nucleus, with smaller numbers closer to the nucleus. Each electron shell contains a specific number of orbitals. An electron comprising a single orbital can hold up to two electrons; a shell with four orbitals can contain up to right electrons. These shells can be filled by chemical bonds from strong attractions that bind atoms together.