Atom Sandhwan Fdk

BHAI KISHAN SINGH GOVT. HIGH . SCHOOL SANDHWAN (FARIDKOT)

Structure of ATOM  Atoms are made of smaller particles called

electrons ,protons,& neutrons . When two or more atoms combine , they form a molecule for exp: two atoms of the element hydrogen combine with one atom of the element oxygen (o) to form a molecule of water (H2O) .

ELECTRONS : -

Electrons are tiny negatively charged particles that form a cloud around the nucleus of an atom. Each electron carries a single fundamental unit of negative electric charge or -1. the electron is one of the lighted particles with a known mass.

ELECTRON DENSITY & ORBITAL SHAPES

PROTONS & NEUTRONS  Protons

carry a positive charge of + 1, exactly the opposite electric charge as electrons. The number of protons in the nucleus determines the total quantity of positive charge in the atom. The number of the protons and the number of electrons or equal, so that the positive & negative charges balance of out to zero –proton is very small. neutrons are about the same size as protons but their mass is slightly greater.

PROPERTIES OF ATOM      

ATOMS HAVE SEVERAL PROPERTIES: 1. ATOM NUMBER 2. MASS NUMBER 3.ATOMIC MASS & WEIGHT 4. ISOTOPES 5. RADIOACTIVITY

RADIOACTIVITY

ISOTOPES

PREPARED BY 9TH CLASS STUDENTS TYPING BY PARMJEET KAUR DESIGNING BY SANTOSH KUMAR HELPED BY AMANDEEP KAUR ( COMPUTER TEACHER )