Atoms & Periodic Table
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Science
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8th Grade
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Constance Bond
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17 Slides • 8 Questions
1
Atoms &
The Periodic Table
Review & Brain Dump
2
Atomic Structure
Nucleus (inside)
Electron Cloud (outside)
3
Nucleus
Contains protons & neutrons
*ALL the mass is located in nucleus
*The charge of the nucleus is positive
4
Protons
Positive Charge
Same mass (size) as neutrons (bigger than electrons)
Tells us the IDENTITY of the element
Equal to the Atomic Number
Equal to the total electrons
(APE)
Mass Number = P + N
(MAN)
5
Neutrons
Neutral Charge
Same mass (size) as protons (bigger than electrons)
Mass Number - P = N
(MAN)
*We cannot find neutrons on the periodic table! We must solve for it using M.A.N.
6
7
Multiple Choice
8
Multiple Choice
9
Fill in the Blanks
10
Electron Cloud
Contains electrons
*Energy levels = period number
*Negatively charged
11
Electrons
Negative Charge
Small (no mass)
Total electrons = number of protons (APE)
Valence electrons = group number (reactivity)
*outer most electrons
12
13
Multiple Choice
The diagram shows a model of an atom. The model has four different symbols on it. Each symbol represents a different role for one of the particles within the atom. In this model, which particle determines the reactivity of this atom?
14
Multiple Choice
The diagram shows a model of an atom. Which element could this model represent?
15
Periodic Table
Groups & Periods
Metals, Metalloids, Nonmetals
16
Groups
Up and down
Group numbers tell us the number of valence electrons (Group 17 = 7 valence electrons)
Elements in the same group have similar reactivities
17
Reactive Groups
Group 1: most reactive metals (1 valence electron)
Group 17 (7A): most reactive nonmetals (7 valence electrons)
Group 18 (8A): Nobel Gases--- least reactive, most stable, inert (8 valence electrons)
18
Periods
Horizontal (side-to-side)
Period number tells us the number of energy levels (rings) in an atom
19
Multiple Choice
Of the following atomic models, which represents the most reactive atom?
20
Multiple Choice
21
Metals
Luster (shiny)
Malleable (bends)
Good conductor (moves heat & electricity)
22
Metalloids
Luster (shiny)
Brittle (breaks)
Semi-conductor (kind of moves heat & electricity)
23
Nonmetals
Dull (not shiny)
Brittle (breaks)
Insulators (does not move heat & electricity)
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25
Multiple Choice
The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed below. Which of these elements is in this group?
Atoms &
The Periodic Table
Review & Brain Dump
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