GRADE 9 SCIENCE ELECTRONIC STRUCTURE OF MATTER.pptx

GRADE 9 SCIENCE ELECTRONIC STRUCTURE OF MATTER.pptx

1. Quarter 2- Matter Module 1: Electronic Structure of Matter

2. Let’s recall your understanding on the concepts of atom. Identify the word being described on the following items.

3. Other Subatomic Particles Protons were discovered by Rutherford in 1919. Neutrons were discovered by James Chadwick in 1932.

4. Subatomic Particles Protons and electrons are the only particles that have a charge. Protons and neutrons have essentially the same mass. The mass of an electron is so small we ignore it.

5. Symbols of Elements Elements are symbolized by one or two letters.

6. Atomic Number All atoms of the same element have the same number of protons: The atomic number (Z)

7. Atomic Mass The mass of an atom in atomic mass units (amu) is the total number of protons and neutrons in the atom.

8. © 2009, Prentice-Hall, Inc. Isotopes Isotopes are atoms of the same element with different masses. Isotopes have different numbers of neutrons. 11 6 C 12 6 C 13 6 C 14 6 C

9. © 2009, Prentice-Hall, Inc. Waves To understand the electronic structure of atoms, one must understand the nature of electromagnetic radiation. The distance between corresponding points on adjacent waves is the wavelength (  ) .

10. © 2009, Prentice-Hall, Inc. Waves The number of waves passing a given point per unit of time is the frequency (  ) . For waves traveling at the same velocity, the longer the wavelength, the smaller the frequency.

11. © 2009, Prentice-Hall, Inc. Electromagnetic Radiation All electromagnetic radiation travels at the same velocity: the speed of light ( c ), 3.00  10 8 m/s. Therefore, c = 