True or False
The cathode ray tube was important in the discovery of the electron.
true
He was the first to say that there is an indivisible particle called atom
Democritus?
J.J. Thomson proposed that electrons might be scattered throughout the atom
Plum Pudding Model
What does the word atom mean
a. divisible
b. indivisible
c. hard particles
a. Divisible
Dalton said that the atoms of all elements are the same
false
The scientist who did the cathode ray experiment and discovered the electron and made the plum pudding model
Thomson
Ernest Rutherford conducted an experiment where he discovered that the atom consisted of a dense, positively charged nucleus and negatively charged orbiting electrons.
Gold Foil Experiment
Which of the following ideas was part of Dalton's theory?
a. All substances are mad of atoms
b. atoms can be created
c. Most substances are made of atoms
a. All substances are mad of atoms
Ernest Rutherford made the plum pudding experiment?
false
He said that there will never be a particle that can't be divided
Aristotle
The experiment Thomson used to discover the electrons
Cathode ray experiment
........... was discovered by JJ Thomson using the cathode ray tube
Electrons
In the modern atomic theory the locations of electrons are described by electron cloud
true
The scientist who discover a tiny dense positively charged are called nucleus
Rutherford
Niels Bohr proposed atoms orbit in different levels in the negatively charged electron cloud.
Energy level model
what model represent current atomic theory?
a. Plum pudding model
b. electron cloud model
c. Rutherford model
b. electron cloud model
Bohr proposed that electrons move in clouds
False
The scientist who made energy level model
Bohr
The theory that propose the location of electron are described with an electron cloud
Modern atomic theory
How would you describe the nucleus?
a. large, positively charged
b. tiny, negatively charged
c. dense, positively charged
c. dense, positively charged