Atomic-Theory-Lesson2 for senior high school gr. 12 STEM

Atomic Theory is good

1. Atomic Theory Ancient Greek Concept of Elements Ancient Greek Concept of Atoms

2. How Matter is View Ancient Greek Concept of Elements Ancient Greek Concept of Atoms Atomic Theories

3. An element is a pure substance that cannot be broken down by any physical or chemical means into simpler substances. An element is made up of the same kind of atoms.

4. Ancient Greek on the Concept of Element Around 450 B.C. Empedocles, a Greek philosopher, and scientist from the South coast of Sicily proposed that there were four elements that everything was made up of. These include Earth, Water, Fire, and Air . These substances constitute all matter.

5. Ancient Greek on the Concept of Atom Around 440 B.C., Leucippus of Miletus, in his lost book “The Greater World System” originated the atom concept. He and his student Democritus believed that matter could be divided into tiny particles until such a point that it can no longer be divided anymore.

6. Five Major Points to their Atomic Idea Point#1: All matter is composed of atoms, which are bits of matter too small to be seen. Atom came from the Greek word atomos which means uncuttable (“a” means “not” and “ tomos ” means “Cuttable” Point#2: There is a void, which is an empty space between atoms. Point#3: Atoms are completely solid.

7. Five Major Points to their Atomic Idea Point#4: Atoms are homogeneous, with no internal structure. Point#5: Atoms are different in size, shape, and weight .

8. Aristotle did not accepted the idea of Democritus, but rather supported Empedocles’ ideas. He associated the four elemental substance- air, water, earth, and fire with four qualities; hot, moist, cold, and dry.

9. Dalton’s Atomic Theory The idea of atomic theory was revived by John Dalton 2000 years after Democritus first proposed it. He formulated the atomic theory of matter that states all matter is composed of small units called atoms, which are identical to the same elements. Atoms of different elements always combine in the same way to form compounds.

10. All matter is composed of indivisible particles called atoms. Atoms of a given element are identical; atoms of a different element have different properties. Chemical reaction involve the combination of atom; not destruction When elements react to form compounds, they react in defined, whole number ratios

11. The Discovery of Subatomic Particles Matter is composed of indivisible atoms and each atom is made of protons, electrons, and neutrons. These subatomic particles have their own space in atom

12. Scientist Discovery Location Model Eugene Goldstein 1850-1930 Positively charged particles as components of canal rays Center or inside the nucleus The Discovery of Subatomic Particles

13. Scientist Discovery Location Model J.J Thomson 1856-1940 Discovered that an atom is composed of negatively charged particles called electrons Outside the nucleus with its own orbit Plum-Pudding Model The Discovery of Subatomic Particles

14. Scientist Discovery Location Model Ernest Rutherford 1871-1937 Coined the term proton Inside the nucleus

15. Scientist Discovery Location Model Neils Bohr 1885-1962 Planetary or Bohr’s Model of Atom n/a

16. Scientist Discovery Location Model James Chadwick 1885-1962 Discovered the neutral particles which he called neutron   Center inside the nucleus.

17. Atom An atom is the basic building block of chemistry. It is the smallest unit of matter that has the characteristic properties of a chemical element.

18. Alchemist Contribution to Modern Chemistry Alchemy is a medieval practice that aims to transform metal into gold. In the 16 th century, alchemy played a role in the scientific revolution, particularly in the development of the atomic structure .

19. Activity Time! Who’s Who?

20. He revived the idea of atomic theory. He states all matter is composed of small units called atoms, which are identical to the same elements

21. He is a student of Leucippus. He believed that matter could be divided into tiny particles until such a point that it can no longer be divided anymore.

22. He discovered that an atom is composed of negatively charged particles called electrons .

23. He proposed the Planetary Model of atom.

24. He discovered the neutral particles which he called neutron.