Category: 2. Atoms and Molecules

The matter is composed of minute particles known as atoms. Atoms are indivisible particles that can’t be destroyed or created through chemical reactions. All atoms of an element have identical chemical properties and mass whereas, atoms of different elements have different chemical properties and masses. Atoms combine in a ratio of small whole numbers to form… Continue reading Salient features of Dalton’s Atomic Theory

It is the mass of an atom in a chemical element. It is roughly equivalent to total neutrons and protons present in the atom. It is expressed in atomic mass units (denoted by u). 1amu is equal to the exactly one-twelfth the mass of 1 atom of C-12 and the relative atomic masses of elements is determined… Continue reading What is Atomic Mass?

An atom is composed of three particles, namely,  neutrons, protons and electrons with hydrogen as an exception without neutrons. Every atom has a nucleus that bounds one or more electrons around it. The nucleus has typically a similar number of protons and neutrons which are together known as nucleons. The protons are positively charged, electrons are… Continue reading What are Atoms made of?

The size of an atom is extremely small, much smaller than our imagination. A layer of an atom as thick as a thin sheet of paper is formed when more than millions of atoms are stacked together. It is impossible to measure the size of an isolated atom because it’s difficult to locate the positions… Continue reading What is the Size of an Atom?

The smallest particle of an element, which may or may not have an independent existence but always takes place in a chemical reaction is called an atom. An atom is defined as the smallest unit that retains the properties of an element. An atom is composed of sub-atomic particles and these cannot be made or… Continue reading Atom Definition Chemistry

Atoms are much too small to be seen; hence experiments to find out their structure and behavior have to be conducted with large numbers of them. From the results of these experiments we may attempt to construct a hypothetical model of an atom that behaves like the true atom. Molecules consist of one or more atoms… Continue reading Atoms and Molecules Definition

What is an Atom? Atoms are defined as “the basic building blocks of matter”. It is the smallest constituent unit of matter that posses the properties of the chemical element. Atoms don’t exist independently, instead, they form ions and molecules which further combine in large numbers to form matter that we see, feel and touch.