Electrons and the Atomic Theory Flashcards
What is a charge?
an electrical property that all protons and electrons have
What is something really weird about electrons?
They have wave-like properties
How are electrons separated?
Electrons are separated by their energy level in what are called shells
What are electron clouds?
The areas where electrons are or will be
Which electrons are closer to the nucleus?
Electrons with a smaller energy level
Which electrons are farther away from the nucleus?
Electrons with a higher energy level
How many electrons can be in an orbital
2
Who is given credit for the first imagining of the atoms?
Democritus
What does the word “atom” originate from?
The Greek word, indivisible
When was the first scientific model of an atom created?
1803 by John Dalton
What did Dalton contribute to the atomic theory
The belief that atoms combined in whole number ratios to create the different compounds all substances are made out of (Also that atoms are m=not created or destroyed in chemical reactions.
When was the idea of a divisible atom with multiple parts proposed and by whom?
In 1897 by J.J. Thompson
What was Dalton’s model of the atom called?
Indivisible particles
WHat was Thompson’s model of the atom called?
The plum pudding model
What was the plum pudding model’s representation?
The idea that an atom was thousands of positively charged particles with thousands of negatively charged particles embedded inside.
WHat is another name for the plum pudding model?
The Watermelon Model
What did Thomas contribute to the atomic theory?
The idea that the atom had multiple parts
When was the idea of the nucleus proposed?
In 1909 by Ernest Rutherford
What did Rutherford contribute to the atomic theory?
The idea that the positive charge in an atom was concentrated in the center instead of whizzing around in a cloud-like formation Thomas had proposed. He also found that electrons buzzed around the nucleus and that most of the atom was empty space
When was it proposed that the electrons orbited the nucleus?
In 1913 by Niels Bohr as well as the idea that electron’s energy levels determined how close they were to the nucleus as well as their orbit
Who discovered the neutron and when?
In 1932 by James Chadwick
What is the current model of the atom called?
The Quantum Model
Who experimented and discovered alpha particles?
Ernest Rutherford
What is an Alpha particle?
Radioactive particles that go through nuclear decay
What do electrons act like opposed to what?
Particles, opposed to waves (Though they do share similar properties)
