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Acidity The acidity of a base is defined as the number of  ionizable  hydroxyl groups in its molecule. Anode It is an electrode through which electrons enter the external circuit. Alpha Rays There are positively charged particles emitted from a radioactive substance. They carry two positive charges and are called helium  nuclie . Analytical Chemistry It is the branch of chemistry which discusses the analytical methods forgetting information about chemical compounds and chemical processes. Atomic Number Number of positively charged particles (protons) present in the nucleus of an atom. Atomic Size Average distance between the nucleus of an atom and its outermost electronic shell.  Its units are nm or pm. Arrehenius  Acid It is a chemical compound which gives proton (H+) in water. Arrehenius  Base It is a chemical compound which gives hydroxide ion (OH-) in water. Atomic Spectrum Spectrum of radiations emitted by the exci...

Metals and Non Metals: Metals 1. Metals have luster shine surface. 2. Metals reflect heat and light. 3. Metals conduct heat and electricity 4. Metals are ductile and can be drawn into wire. Non-Metals 1. Non-Metals have no luster. 2. Non-Metals usually don't reflect heat and light. 3. Non-Metals do not conduct heat and electricity. 4. Non-Metals are non ductile and cannot be drawn into wire. 5. Non-Metals are non-malleable and can not form sheets. Homogeneous and Heterogeneous Mixture: Homogeneous Mixture 1. Those mixtures, which have uniform composition throughout their mass  are called homogeneous mixtures. 2. Homogeneous mixture has only one phase through out its mass. 3. Homogeneous mixture  are  also known as solution. 4. Examples: Salt and water, Sugar and water. Heterogeneous Mixture 1. Those mixtures, which do not have uniform composition through their mass  are called Heterogeneous Mixture. 2. Heterogeneous Mixtu...