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Journal 41) Section #1 Key Terms: atom, nucleus, proton, neutron, electron, energy level, atomic number, isotope, mass number List on LEFT side of Cornell.

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Presentation on theme: "Journal 41) Section #1 Key Terms: atom, nucleus, proton, neutron, electron, energy level, atomic number, isotope, mass number List on LEFT side of Cornell."— Presentation transcript:

1 Journal 41) Section #1 Key Terms: atom, nucleus, proton, neutron, electron, energy level, atomic number, isotope, mass number List on LEFT side of Cornell Notes (you may have them from yesterday) Find and record definitions (pg )

2 Definitions: 1) The basic particle from which all elements are made
2) Center core of an atom 3) Positively charged particle in nucleus 4) Particle in nucleus with no electric charge 5) Negatively charged particle outside of nucleus

3 6) Electron’s energy, related to distance from nucleus (shell / orbit / cloud)
7) Number of protons in atom (number on periodic table) 8) Atoms of same element with different numbers of neutrons 9) Sum of the protons and neutrons in the atom’s nucleus

4 Draw Lithium atom 7Li Label all parts & use a quarter of the page
Atomic number = 3 Mass number = 7 Nucleus (protons and neutrons) Electrons (2 in first energy level and 1 in second energy level) Electrical charges

5 Draw 6Li Another isotope (less common in nature) has a mass number of 6 Draw it (How is it different from the first drawing?)

6 Academic Words “This new particle, called a neutron, was hard to detect because it has no electric charge.” Detect: to discover or determine the existence, presence, or fact of Ex: Scientists have used modern telescopes to detect distant stars

7 Academic Words “A period contains a series of different elements.” Series: a number of things or events of the same class coming one after the other Ex: Juan’s house is one of a series of houses all built on the same block by the same builder.

8 Academic Words Similar: having characteristics in common
“The metals in a group, or family, have similar properties, and these family properties change gradually as you move across the table.” Similar: having characteristics in common Ex: Gold and silver are similar in many ways.

9 Distributes: gives out or delivers
Academic Words “There, it is absorbed into your bloodstream, which distributes it all over your body.” Distributes: gives out or delivers Ex: Our newspaper carrier distributes the local newspaper to all the families in our neighborhood.

10 Academic Words “Becquerel assumed that sunlight was necessary for the energy release.” Assumed: taken as granted or true, supposed Ex: Tara assumed that the bus would be late because it was always late on a rainy day.

11 Section #2 1) Atomic mass 2) Periodic table 3) Period 4) Group
5) Chemical symbol Copy key terms on LEFT side of page Find definitions on pages and record them on RIGHT side of page

12 Mixed up Definitions Representation of an element usually consisting of 1 or 2 letters Horizontal rows on periodic table Columns on table, also called families, that contain elements with similar chemical properties Average mass of all the isotopes of an element Arrangement of elements showing a repeating pattern of their properties

13 Mendeleev created the periodic table in 1869 by arranging the 63 known elements in order of their atomic mass, then grouping them according to their physical properties Look at his list on page 133 and compare it to the periodic table on pages

14 What do you know? Take a minute and look at your notes
Tell your neighbor something you learned What did your neighbor learn?

15 Element Project Record of Research must be stamped!
Work on your written project for the remainder of class Rough draft is due this Friday


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