NEET GURU

Structure of atom Mind map Atomic structure class 11 Chemistry Best revision shortnotes PDF is given at end of this page👇👇 Atoms are the building blocks of elements. They are the smallest parts of an element that chemically react. The first atomic theory, proposed by John Dalton in 1808, regarded atom as the ultimate indivisible particle of matter. Towards the end of the nineteenth century, it was proved experimentally that atoms are divisible and consist of three fundamental particles: electrons, protons and neutrons. Atoms are the basic building blocks of all matter. They are composed of three main components: protons, neutrons, and electrons.  Protons are positively charged particles located in the nucleus of an atom. The number of protons in an atom is called its atomic number and determines the element it belongs to.  Neutrons are electrically neutral particles also found in the nucleus of an atom. They help to keep the nucleus stable. The total number of neutrons and p...

Periodic Table - Classification of Elements and Periodic Properties mind map Class 11 PDF is given at end of this page In this Unit, you have studied the development of the Periodic Law and the Periodic Table. Mendeleev’s Periodic Table was based on atomic masses. Modern Periodic Table arranges the elements in the order of their atomic numbers in seven horizontal rows (periods) and eighteen vertical columns. Atomic numbers in a period are consecutive, whereas in a group they increase in a pattern.  The periodic table is a tabular arrangement of elements that organizes them according to their atomic number, electron configuration, and recurring chemical properties. The table is organized into vertical columns (called groups) and horizontal rows (called periods). Each element in the periodic table is represented by its atomic symbol, atomic number, and its average atomic mass. The periodic table was first proposed by Russian chemist Dmitri Mendeleev in 1869. He organized the 63 known...