For example, a helium atom has an atomic mass of 4, but an atomic number (or positive charge) of 2. Since electrons have almost no mass, it seemed that something besides the protons in the nucleus ...

Led by Prof. Dr. Nicola Pinna and Dr. Patrícia Russo from the Department of Chemistry at Humboldt-Universität zu Berlin (HU), ...

The atomic number describes the number of protons in the nucleus of the element. Hydrogen’s atomic number is 1, helium’s is 2, lithium’s is 3 and so on.

Atomic-level studies of the architecture of tiny sodium channel proteins, critical to generating electrical signals that start off each beat of the heart, are imparting striking details about ...