오늘은 4일차입니다. 오늘이면 시험이 끝나게 되어 이 공부를 더 열심히 할 수 있을 것 같습니다. 물론 농구도 말이죠.
The atomic theory of matter (물질의 원자 이론)
- Atom
- this notion remmerged in europe during the seventeenth century(17세기 유럽에서 이 개념이 재등장)
- Dalton's theory
- law of constant composition, based on postulate 4:
given compound, the relative numbers and kinds of atoms are constant
- law of conversation of mass based on postulate 3:
total mass materials after a chemical reaction is same as not reaction.
- law of multiple proportions:
if two elements A and B combine to form one compound, the mass of an element when it combines with the mass of another element is determined by the ratio of small integers.
- The discovery of atomic structure
- Subatomic particle(아원자 입자)
- atom is composed by it.
- Cathocode rays and electrons
- cathode rays (음극선)
- scientists began to study electrical discharge through a glass tube pumped by almost empty of a air.
(과학자들은 진공 상태의 유리관을 통해 전기 방전을 연구함)
- when a high voltage was applied to the electrodes in the tube, radiation was produced between the electrodes (튜브의 전극에 고전압을 가하면 전극 사이에 방사능이 발생)
- This called cathode rays
- electrons are indivisible
- Radioactivity(방사능)
- Henri Becquerel discoverd that a compound of uranium spontaneously emits high energy radiation.
(우라늄 화합물이 자연적으로 고에너지 방사선을 방출하는 것을 밝혀냄)
- The nuclear model of the atom.
- Rutherford created the first atom model.
(러더퍼드는 첫 원자의 모습을 구상했다.)
- And it called nucleus (이)