For decades, scientists believed that lead-208, a "doubly magic" and highly stable atomic nucleus, was perfectly spherical.
The periodic table The periodic table is a chart of all the elements arranged in increasing atomic number. Group 1 alkali metals The Group 1 elements, also known as the alkali metals, all react ...
Chemists use symbols and formulae to represent elements and compounds ... The method chosen depends on the type of mixture. Atomic structure - AQA Atoms consist of a nucleus containing protons ...