For example, the atomic number of sodium is 11. Every sodium atom has 11 protons and 11 electrons. It has 11 positive charges and 11 negative charges. Atoms of different elements usually have ...

The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

It arranges all natural and synthetic elements by their atomic number , ranging from 1 to 118 ... pure substances made from a ...

they kept seeing that the atomic number (number of protons in the nucleus, equivalent to the positive charge of the atom) was less than the atomic mass (average mass of the atom). For example ...

Nickel is a metal in group VIII of the periodic table with atomic number 29, an atomic weight of 58.71, and a density of 8.9. It has a melting point of 1453 C. The electronic configuration for the Ni ...