Chapter 2 The Atomic Theory Of Matter Flashcards
Atoms reamerged after ________ ______ in 17th century _____
Aristotelean physics
Europe
The concept of atoms is derived back from
Early Greek philosophers around 460-370 BCE
Daltons atomic theory
1 and 2
- Each element is composed of extremely small particles called atoms
- All atoms of a given element are identical, but the atoms of one element are different from the atoms of all other elements
Law of multiple proportions
If two elements A and B combine to form more than one compound, the masses of B that can combine with a given mass of A are in the ratio of small whole numbers.
Daltons atomic theory
Parts 3 and 4
- Atoms are neither created or destroyed in chemical reactions
- Compounds are formed when atoms of more than one element combine; a given compound always has the same relative number and kind of atoms
Definition: Subatomic particles
Includes electrons, protons, and neutrons
Thompson created the ______ ____ experiment that led to the discovery of _____
Cathode ray
Electrons
Electrons charge per gram=
1.76*10^8
Mass of an electron=________
9.1*10^-28 grams
Ruthorfords experiments revealed
Alpha emission
Beta emission
Gamma rays
JJ thomson’s model is called
The plum pudding models
Rutherford updated the plum pudding model by positing the ____ ____
Nuclear model of the atom
The nucleus contains the
Positive charge of an atom as well as neutrons
Atoms have diameters of
1-5A
A= angstrom
1 angstrom= 1E-10 meters
Proton amu=
Electron amu=
Neutron amu=
- 0073
- 486*10^-4
- 0087
