1 atomic model ver 2.pptx grade 7 science

atomic model ppt

1. SCIENCE 7 Ms. Mary Ann R. De Villa

2. Mr. Neil Tran

3. DALTON'S ATOMIC MODEL Proponent: John Dalton Year Introduced: Early 19th century (1803) Main Features: Atoms are indivisible and indestructible particles. Atoms of a given element are identical in mass and properties.

4. - the main idea conveyed by the author in a literary work. Examples: Honesty is the best policy. Believe in yourself. THEME

5. DALTON'S ATOMIC MODEL Main Features: 3. Atoms of different elements have different masses and properties. 4. Atoms combine in simple, whole-number ratios to form compounds. 5. Chemical reactions involve rearrangement of atoms but do not change the atoms themselves.

6. THOMSON'S PLUM PUDDING MODEL Proponent: J.J. Thomson Year Introduced: 1904 Main Features: The atom is a sphere of positive charge. Electrons are embedded within this sphere, like plums in a pudding. The positive charge is spread throughout the atom, balancing the negative charge of the electrons.

7. TONE

8. RUTHERFORD'S NUCLEAR MODEL Proponent: Ernest Rutherford Year Introduced: 1911 Main Features: The atom has a small, dense, positively charged nucleus at its center. Electrons orbit the nucleus in mostly empty space. The nucleus contains most of the atom's mass.

9. - the feeling or emotion that the reader gets when reading a story. Examples: Calm Peaceful MOOD

10. BOHR'S MODEL Proponent: Niel Bohr Year Introduced: 1913 Main Features: Electrons orbit the nucleus in specific, quantized orbits. Electrons can jump between orbits by absorbing or emitting energy in discrete amounts (quanta). Each orbit corresponds to a specific energy level.

11. QUANTUM MECHANICAL MODEL Proponents: Developed by various scientists, including Erwin Schrödinger and Werner Heisenberg Year Introduced: 1920s

12. QUANTUM MECHANICAL MODEL Electrons do not have fixed orbits but are described by probability distributions. The behavior of electrons is governed by wave mechanics. The Heisenberg Uncertainty Principle states that one cannot precisely know both the position and momentum of an electron.

13. - the perspective from which the story is narrated or told. Examples: First Person Second Person Third Person POINT OF VIEW

14. Tom is in his kitchen, preparing a cold drink on a warm summer day. He decides to make a refreshing iced tea and starts by filling a glass with ice cubes from the freezer. As he watches the ice cubes melt, he reflects on the particle model of matter:

15. Tom begins by taking a few ice cubes out of the freezer. He notices that the ice cubes are solid and have a defined shape and volume. He explains that in their solid state, the water molecules in the ice are tightly packed together and arranged in a regular pattern Tom places the ice cubes in

16. the glass and observes as they start to melt. He notices that as the ice cubes come into contact with the warmer air and the glass, they gradually begin to change from solid to liquid. He explains that the heat from the surroundings is transferring energy to the ice cubes, causing the water molecules to gain enough kinetic energy to

17. overcome the attractive forces holding them together in the solid lattice. As the ice cubes continue to melt, Tom observes that liquid water collects at the bottom of the glass. He explains that in the liquid state, the water molecules are still close together but have more freedom to move past one another.

18. THAT'S ALL FOR TODAY! See you tomorrow!