The smallest object that retains properties of an element. Back to top . Having the characteristics of a base. Bohr's atom Bohr made significant contributions to the atom. Back to top .
Protons have positive charges while electrons have negative charges.
Like charges repel each other while opposite charges, such as protons and electrons, attract one another. An expression of a fundamental change in the chemical substances. The main colligative properties addressed at this web site are boiling point elevation and freezing point depression. When substances combine with oxygen and release energy. Two or more atoms joined together chemically, with covalent or ionic bonds.