Science Quiz #1 Flashcards
What did Democritus propose for the atomic model.
Atom is tiny, hard and uncuttable. The shapes of atom explain behaviors of elements. Atoms of water are round ball. Atoms of fire have sharp edges.
What did John Dalton propose for the aAtomic Theory
Solid, indivisble sphere could not destroy or reconstruct
What did J.J Thomson propose in the atomic theory
An atom is a sphere of positive charge containing a few negatively charged particles, called electrons distributed in the sphere like raisins in a plum pudding
What did Rutherford propose in the atomic theory.
Divisible units composed of positive charges concentrated in the nucleus with negative charges orbiting around the nucleus
What did Niels Bohr propose for the atomic theory
Electrons in atoms are restricted to a certain circular orbit about the nucleus. Similar to the planets orbit around the sun.
What did Schrodinger propose for the atomic theory
A probablitity to find electrons within a space surrounding the nucleus. The cloud is denser where the probability of finding the electrons is high. The cloud is less dense where the probability of finding the electron is low.
When did Democritus propose his theory?
400-300 B.C
When did John Dalton propose his theory
1803
When did J.J Thompson propose his theory
1897
When did Rutherford propose his theory
1909
When did Niels Bohr propose his theory
1913
When did Schrödinger propose his theory
1926
Who was the first person to propose an atomic model theory and when did they propose it?
Democritus, he proposed it on 400-300 B.C
What is different in Bohr’s Atomic Model?
- Electrons travel in fixed circular paths known as orbits
- Explained why substances emit their characteristic colors.
- Introduced the concept of quantized amount of energy for electrons in the atom and the transition of electrons between energy levels
- introduced the principal energy level n
Who is Louie De Broglie?
Louie De Broglie is proponent of the wave particle duality of matter. Wave particle duality of matter proposes that all matter including electrons, can also exist as a wave.
Who is Werner Karl Heisenberg?
Proponent of the Uncertainty Principle. A principle that states that it is impossible to know the exact position and momentum of an electron at the same time.
