問題一覧
1
He was a Greek Philosopher and a central figure in the development of philosophical atomism and of the atomic theory
Democritus , 400 bc
2
It is the belief that indivisible and indestructible atoms are the basic components of all matter in the universe
atomism
3
It is the belief that atom is the simplest form
atomism
4
It is the basic building block of matter
atoms
5
These are tiny, uncuttable, solid particles that are surrounded by empty space and constantly moving at random
atoms
6
Different kinds of matter consist of different types of ______ of atoms
arrangements
7
Book by John Dalton
a new system of chemical philosophy , 1808
8
Postulates of Dalton’s Atomic Theory: ✅
✅
9
According to this law, different samples of the same compounds always contains its constituent elements in the same proportion by mass
law of definite proportions
10
According to this law, if two elements combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element are in ratios of small whole numbers
law of multiple proportions
11
According to this law, matter can not be created or destroyed
law of conservation of mass
12
It is the emission and transmission of energy through space in the form of waves
radiation
13
A device used to investigate the phenomenon of radiations
cathode ray tube
14
It is the forerunner of the television tube
cathode ray tube
15
Parts of cathode ray tube:
cathode , anode , high voltage , fluorescent screen
16
A moving charged body behaves like a ______ and can interact with electric and magnetic fields
magnet
17
Explain how cathode ray tube works: ✅
✅
18
The number of protons in the nucleus of each atom of an element
atomic number
19
The total number of neutrons and protons present in the nucleus of an atom of an element
mass number
20
Atoms that have the same atomic number but different mass numbers
isotopes