Read first – Atoms – Its Symbols Atoms – Atomic Mass What is an atom? As we know, an atom is the smallest building block of everything that exists. It is composed of three sub-atomic particles: the proton, neutron, and electron. Protons and neutrons make up the nucleus of the atom, a dense and positively …
Every element has a definite capacity to combine with other elements. The combining capacity of an element is called its valency.” In normal course, hydrogen has 1, oxygen has 2, nitrogen has 3 and carbon has 4 valency. This will depend upon the nature of the element. Read First – Ions – Cations and …
Simple ions – The ions which are formed from single atom carrying a positive or negative charge are called simple ions or mono-atomic ions. Example – Na+, Cl–, O-2, Al+3, N-3(nitride), Mg+2, Ca+2, Cu+2, Fe+2etc. Polyatomic ions -Polyatomic ions or compound ions are molecules formed from groups of atoms bonded together that carry a positive …
Atoms are neutral; they contain the same number of protons (positive particles) and electrons (negative particles). When the numbers of these subatomic particles are not equal, the atom is electrically charged and is called an ion i.e. ions are electrically charged atoms with extra electrons or missing electrons. It means ions are formed when atoms lose or gain …
How do atoms exist? Atoms of elements exist in nature either in uncombined form or in combined form. (a) The atoms of some elements called the noble-gas elements (helium, neon, argon, krypton, xenon) are normally found in nature as isolated (single) atoms as they are chemically unreactive. (b) The atoms of most elements are chemically …
Read first – The Atom – Its Size Atom – Its symbols Atomic mass of an element (1) The mass of an atom is related to the number of protons, electrons, and neutrons it has. Atom of an element is extremely small and therefore it is not easy to weigh it. Even that, it is …
Table of content – Reasons for Dalton’s atomic theory Dalton’s Atomic Theory Drawbacks of Dalton’s theory Importance of Dalton’s theory Frequently asked questions Important to learn – Law of Conservation of Mass Law of Definite Proportions / Constant Composition Mole Concept – Importance and formulas John Dalton FRS (6 September 1766 – 27 July 1844) John …
