Electron delocalisation extends throughout the cyclic tetrapyrrole ring of porphyrins and gives rise to an intense transition at 400 nm called the Soret band.

TLS Online TPP Program

#Id: 3774

#Unit 1. Molecules and their Interaction Relevant to Biology

Proton & neutron are found in the center of the atom, a place called the nucleus.

TLS Online TPP Program

#Id: 3775

#Unit 1. Molecules and their Interaction Relevant to Biology

The electrons revolve in orbits around the nucleus.

TLS Online TPP Program

#Id: 3776

#Unit 1. Molecules and their Interaction Relevant to Biology

Elements are made of atoms. While the atoms may have different weights and organization, they are all built in the same way.

TLS Online TPP Program

#Id: 3777

#Unit 1. Molecules and their Interaction Relevant to Biology

The diameter of the nucleus is in the range of 1.75 fm (1.75 × 10⁻¹⁵m) for hydrogen.

TLS Online TPP Program

#Id: 3778

#Unit 1. Molecules and their Interaction Relevant to Biology

the atomic radii of chemical elements are a complicated task as the size of an atom is of the order of 1.2×10^-10m.

TLS Online TPP Program

#Id: 3781

#Unit 1. Molecules and their Interaction Relevant to Biology

The multi-atom combinations are called molecules. A molecule is the smallest part of a substance that has the physical and chemical properties of that substance.