Atomic Theory and Atomic Structure

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Presentation transcript:

Atomic Theory and Atomic Structure Chemistry Review Atomic Theory and Atomic Structure

Who am I?

Responsible for naming the atom Dalton Bohr Rutherford Democritus

Who am I?

I proposed the atomic theory. Bohr Rutherford Chadwick Dalton Democritus

How was my atomic theory incorrect? All elements are composed of atoms which are indivisible. Atoms of the same element are alike. Compounds form by joining 2 or more elements.

Whose model is this?

The previous model showed positive and negative charges mixed like “Plum Pudding” Bohr Dalton Thomson Rutherford

Who am I and here is my model

Discovered the nucleus had a positive charge with electrons outside of it. Bohr Dalton Rutherford Thomson

Rutherford Gold Foil Experiment The reflected alpha particles bounced off of the positively charged nucleus – which proved the existence of the nucleus. True or False? True – alpha particles are positive The reflected alpha particles bounced off of the atoms in the gold foil – which proved the existence of atoms. True or False? False

Rutherford Gold Foil Experiment Most of the alpha particles went straight through the gold foil undeflected – which proved that the positive charge was spread out evenly through the atom. True or False False. Positive would reflect positive.

Who am I ?

My contribution to the atomic theory development was Nothing, I was a loser. Discovered protons. Placed electrons in specific energy levels. Discovered neutrons.

Who am I ?

Who am I and what did I do? Rutherford and discovered protons and nucleus. Thompson and discovered electrons. Chadwick, and discovered neutrons.

Why were the neutrons so difficult to detect? Because they are so massive. Because they have no charge. Because they have numerous charges.

Subatomic Particles Particle Symbol Charge Relative Mass Electron e- - 0 Proton p+ + 1 Neutron n neutral 1

State the number of protons for Nitrogen

State the number of protons for Sulfur

State the number of protons for Barium

Number of Electrons An atom is neutral The net charge is zero Number of protons = Number of electrons Atomic number = Number of electrons

Ions – charged atoms If an ion gains an electron it becomes ______________ charged and is called an _____________. Answer: negatively anion

Ions: charged atoms If an ion loses an electron , it becomes ____________ charged, and is called a ______________. Answer: positively, cation

An atom of zinc has a mass number of 65. Number of protons in zinc are 30 35 65 125

The number of neutrons in zinc are 30 35 65 125

What is the mass number of a zinc isotope with 37 neutrons? 65 67 125

An atom has 14 protons and 20 neutrons. Its atomic number is 16 34 201

An atom has 14 protons and 20 neutrons. Its mass number is 16 34 8

An atoms has 14 protons and 20 neutrons. The element is Si Ca Se Lol

If an element has 12 protons and 12 neutrons, how many electrons are found in the nucleus? A. 12 B. 24 C. Only the ones with lots of energy. D. No electrons are found in nucleus.

17 Ions 37Cl -1 How many protons? How many neutrons? How many electrons? Anion or Cation?