IntroductionMade By :- Sanyam Ohra      Class :- IX th A   Submit To :- Veer Sir       Roll No :- 20
Particles• Atoms• molecules
Whats an atom?                 Definition:A microscopic small particle that could notbe made any smaller and still behave ...
Atoms• Atoms consist of protons, neutrons, electrons• The atomic structure is shown in the diagram  below• Protons have po...
ATOMIC STRUCTURE
ATOMIC STRUCTURE
Properties           Particle    Mass (kg)         Mass (amu)#    Charge*Electron              9.10939 x 10 -31    0.00055...
Atoms•   Sub-atomic particles•   Electrons•   Protons•   Neutrons
ATOMIC PARTICLES:• Atoms consist of three subatomic particles:• electrons  – electrons are negatively charged particles an...
ELECTRONS•   Small negatively charged particle•   Orbit, circle, around the nucleus•   Have no mass.•   Atoms are neutral....
PROTONS:• small, positively charged particles• reside in the nucleus• along with the neutron, make up most of the  mass of...
NEUTRONS:• small particles with no charge• reside in the nucleus• along with the proton, make up most of the  mass of the ...
ATOMS--Daltons Atomic Theory• All matter (including elements) is composed of  atoms; each atom is a very small, chemically...
Atomic theory of matter• Matter composed of atoms• Atoms of given element have identical  properties• Different elements h...
Whats a molecule?              Definition:The smallest particles of an element or compound that can exist and retain the c...
Molecules•Molecular formula gives composition:number of atoms of each elementpresent•Molecular mass= sum of masses ofatoms
EXAMPLES OF MOLECULES
Examples of molecules
Representing molecules• Names: ethanol, ethyl alcohol•Formulas: C2H8O, C2H5OH, CH3CH2OH•Structural drawings•Models
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Sanyam ohra

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Sanyam ohra

  1. 1. IntroductionMade By :- Sanyam Ohra Class :- IX th A Submit To :- Veer Sir Roll No :- 20
  2. 2. Particles• Atoms• molecules
  3. 3. Whats an atom? Definition:A microscopic small particle that could notbe made any smaller and still behave as a chemical system. Atoms are the smallest particles that can exist and represent elements identity. Atoms cannot be created or destroyed
  4. 4. Atoms• Atoms consist of protons, neutrons, electrons• The atomic structure is shown in the diagram below• Protons have positive charge• Electrons have negative charge• Neutrons have no charge
  5. 5. ATOMIC STRUCTURE
  6. 6. ATOMIC STRUCTURE
  7. 7. Properties Particle Mass (kg) Mass (amu)# Charge*Electron 9.10939 x 10 -31 0.00055 = 0 -1Proton 1.67262 x 10 -27 1.00728 = 1 +1Neutron 1.67493 x 10 -27 1.00866 = 1 0
  8. 8. Atoms• Sub-atomic particles• Electrons• Protons• Neutrons
  9. 9. ATOMIC PARTICLES:• Atoms consist of three subatomic particles:• electrons – electrons are negatively charged particles and their properties are summarized in the following table• protons – protons are positively charged particles and their properties are summarized in the following table• neutrons – neutrons have no charge and their properties are summarized in the following table
  10. 10. ELECTRONS• Small negatively charged particle• Orbit, circle, around the nucleus• Have no mass.• Atoms are neutral.• Number of electrons = number of protons
  11. 11. PROTONS:• small, positively charged particles• reside in the nucleus• along with the neutron, make up most of the mass of the atom• the number of protons is what defines the type of a particular atom.• Atoms are neutral• Number of protons = number of electrons
  12. 12. NEUTRONS:• small particles with no charge• reside in the nucleus• along with the proton, make up most of the mass of the atom
  13. 13. ATOMS--Daltons Atomic Theory• All matter (including elements) is composed of atoms; each atom is a very small, chemically indivisible particle – the word atom is from the Greek word "atmos" which means "cannot be cut apart"• elements are different because they are composed of different types of atoms• each type of atom has properties different from other atoms
  14. 14. Atomic theory of matter• Matter composed of atoms• Atoms of given element have identical properties• Different elements have different properties• Atoms combine in whole number ratios• Not created or destroyed in ordinary chemical reactions
  15. 15. Whats a molecule? Definition:The smallest particles of an element or compound that can exist and retain the chemical properties of that element or compound
  16. 16. Molecules•Molecular formula gives composition:number of atoms of each elementpresent•Molecular mass= sum of masses ofatoms
  17. 17. EXAMPLES OF MOLECULES
  18. 18. Examples of molecules
  19. 19. Representing molecules• Names: ethanol, ethyl alcohol•Formulas: C2H8O, C2H5OH, CH3CH2OH•Structural drawings•Models

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