Your cell phone should be away during all times today!!

Learning Intentions

• You can match a description of a discovery that lead to our current atomic theory, with a picture of the experiment or device used to make the discovery, and then a picture and name of the scientist that made the discovery.

• You can describe how electron, protons and neutrons relate to one another in mass and charge, where the are found in an atom, and how they can be determine for a particular element.

• You can write shorthand notation to indicate atomic number and mass number for a particular element.

Content Standards being covered:

Student understands the structure of matter at the atomic level and the history that lead to our current understanding.
51. Atoms of elements are the smallest discrete forms of matter in the universe
52. Each element has a nucleus, made of protons and neutrons, which surrounded by a cloud of randomly moving electrons.
53. Protons are positively charged, neutrons are neutral, and electrons are negatively charged.
54. Protons and neutrons have a general mass of 1 atomic mass unit (amu), while an electron has a relative mass of 0.0005 amu. Protons and neutrons therefore contribute to an atom's mass and can be added together to determine atomic mass. The electron’s mass is not significant in comparison.
57.Democritus, an ancient Greek, was the first to conceptualize the atom and called this theoretical particle “atomos”, meaning indivisible
58. John Dalton proposed the “Atomic Theory”- 4 key ideas that impact our understanding of Chemistry to this day
59. Dmitri Mendeleev proposed a pattern for organizing elements in 1869 that has developed into the modern, most commonly used, Periodic Table
60. J.J. Thomson used cathode rays to discover the electron
63. R.A. Millikan used the oil drop experiment to discover the mass of an electron
64. Using the gold foil experiment, Ernest Rutherford discovered a very small and very dense positively charged nucleus at the center of an atom.
65. Neils Bohr proposed an atomic structure that described electrons orbiting the nucleus like planets around the Sun
66. James Chadwick discovered the neutron using alpha particles
67. Ernest Shrodinger used his equation to explain the wave nature of the electrons that led to the quantum mechanic model of the atom.

Habits of Mind/Life skills being covered:

Striving for Accuracy

Journal Entry:

What do you know about the subatomic particles found in each atom? How do you determine how many of each an element has?