A system to unambiguously describe the configurations of molecules with more than one asymmetric center was devised in 1956 by Robert Cahn, Christopher Ingold, and Vladimir Prelog. In the Cahn–Ingold– Prelog or RS system

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#Id: 3777

#Section 2: General Biology

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

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#Id: 3776

#Section 2: General Biology

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

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#Id: 3775

#Section 2: General Biology

The electrons revolve in orbits around the nucleus.

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#Id: 3774

#Section 2: General Biology

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

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#Id: 3773

#Section 2: General Biology

An atom has three parts: Proton carries positive charge, Electron carries negative charge, While Neutron carries no charge.

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#Id: 3772

#Section 2: General Biology

Matter is anything that takes up space and has mass.