Question

Difference between scanning electron microscopy and atomic force microscopy

Answer 1

 



GEETANJALI asked in Science 

... atoms and molecules? differentiatebetween protons electrons ...

An atom is defined as the basic unit of element which possesses the properties of the element. By basic, we mean that it is the building block of matter . It is the smallest particle of an element that can take part in a chemical reaction. Every atom consists of protons, neutrons and electrons. For example Carbon will consist of atoms which will show the properties of carbon only and not any other element.


A molecule on the other hand is a group of two or more atoms which combine together to form a single species, whose properties are different from that of the combining elements. It is the smallest unit of a compound. For example, 2 atoms of Hydrogen and one atom of oxygen combine to form one molecule of water. 

An atom is composed of three particles - electrons, protons and neutrons. 

The proton is a positively charged particle, the electron is a negatively charged particle and a neutron is a neutral particle which does not carry any charge. While the protons and neutrons are present in the centre of the atom in a small body called nucleus, the electrons revolve around in nucleus in definite paths called orbits. Also the mass of a proton is 1.673 X 10-27 Kg, mass of a neutron is 1.675 X 10-27 Kg while mass of an electron is 9.1 X 10-31 Kg.

hope u understood