Chemistry

Acids, Bases and Salts - Acids * Any substance that releases hydrogen ions when dissolved in water is an acid. * Acids obtained from food like curd, lemons, raw mango, citrus fruits and gooseberry are called organic acids. * Hydrochloric acid, sulphuric acid and nitric acid are called inorganic or mineral acids. Acids have the ... Read more

Metals and Non-Metals * Metals are elements that have a tendency to lose electrons and form positively charged ions or cations. * Elements that have a tendency to accept electron to form negatively charged ions or anions are called non- metals. * Metals are placed on the extreme left in the periodic table, while non-metals ... Read more

Modern Periodic Table * Atomic number is the number of protons in an atom. * The number of electrons in an atom is equal to the number of protons. * An atom is electrically neutral. * Valence electrons: Electrons in the outermost shell of an atom. * Electronic configuration: The arrangement of electrons in an ... Read more