Do Now: Match the scientist with their contribution to the atom A. Dalton1. Mass of electron B. Thomson2. atomic theory C. Milikan3. discovered electron.

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Presentation transcript:

Do Now: Match the scientist with their contribution to the atom A. Dalton1. Mass of electron B. Thomson2. atomic theory C. Milikan3. discovered electron D. Rutherford4. discovered nucleus

Distinguishing Among Atoms Review: Protons, neutrons and electrons are the sub particles of the atom Neutrons and protons are more massive than electron (determine the mass of atom)

Atomic number Number of protons in the element Easily distinguish elements because they all have different number of protons As long as there is no charge to the element, electrons = protons

What is the atomic number of the following 1. Hydrogen 2. Oxygen 3. Boron 4. Carbon

How many protons and electrons are the following 1. Nitrogen 2. Magnesium 3. Calcium 2+ (note the 2+) 4. Fluorine 1- (note the 1-)

Mass Number Protons + neutrons What is the mass number of the following: 1. Chlorine (17 protons, 18 neutrons) 2. Helium (2 protons, 2 neutrons) 3. Lithium (3 protons, 4 neutrons) 4. Mercury (80 protons, 84 neutrons)

Isotopes Same number of protons, different number of neutrons Average of all isotopes and their abundance is the atomic mass (amu) These atoms still have same chemical properties because it is the electrons and protons that give the chemical behavior

What is the mass number of the following Neon’s protons, 10 neutrons protons, 11 neutrons protons, 9 neutrons protons, 12 neutrons Looking at the Periodic Table, which isotope is most abundant?

Boron has two known isotopes, Boron-10 and Boron-11. The atomic mass of boron is amu, which isotope is more abundant?

Calculate the atomic mass of carbon-13 (1.11% natural abundance) and carbon-12 (99.89% abundance) Calculate the atomic mass, you need to multiply the mass number of each isotope by its natural abundance (move decimal over 2 to the left) and add all products