The unit for atomic mass is “u”, earlier it was “amu”. The absolute mass of an atom is hard to find and therefore, the relative mass of an atom is introduced. Since the law of constant proportions could be explained because of the introduction of atomic mass, scientists decided to determine the mass. According to dalton, each element has a certain mass known as atomic mass. For instance, the Oxygen atom is denoted as O, aluminum is denoted as Al, and so on.ĭalton gave the concept of atomic mass. Mostly, the symbol of the name of atoms is the first letter in the capital, if there are 2 letters used, the other letter is a small letter. The name of the atoms and elements are now given by IUPAC (International union of pure and applied chemistry). The radius of the atom is measured in a nanometer. Atoms are extremely small, when millions of atoms are combined together, a very small piece of matter is obtained. The most basic or the building blocks of matter are atoms. Let’s learn in detail about atoms and molecules, What are Atoms? By the end of the 18th century, scientists realized that there are elements and molecules and the combination of elements form a molecule. However, there shall come a point when the matter no longer can be divided further and that smallest part is called Parmanu. Indian philosopher Maharishi kanad postulated that if a matter is divided into further smaller pieces, it will have smaller parts. ISRO CS Syllabus for Scientist/Engineer Exam.

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Molar mass worksheet