Everyone at that time imagined the atom as a "plum pudding ... of light emitted by real hydrogen atoms. Bohr's theory that electrons existed in set orbits around the nucleus was the key to ...

Save guides, add subjects and pick up where you left off with your BBC account. An element's atomic number defines it. An element with 17 protons will always be chlorine. However an element's mass ...

In fact, each gene in cellular DNA contains the code for a unique protein structure ... carbon atom linked to an amino group, a carboxyl group, a hydrogen atom, and a variable component called ...

Without the acidic hydrogen atoms it is ... probably impossible to build this structure with a ribose sugar in place of the deoxyribose, as the extra oxygen atom would make too close a van der ...

Eos is approximately 300 light-years from Earth, situated at the boundary of the Local Bubble, a vast, gas-filled region that ...

This image illustrates the general structure of an amino acid.The central carbon atom (C) is bonded to a hydrogen atom (H), an amino group (NH2), a carboxyl group (COOH), and a variable side chain (R ...