chapter 4 lesson 3 - weeblybouldercreekwinters.weebly.com/.../chapter_4_lesson_3.pdfchapter 4 lesson...
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Chapter 4 Lesson 3
Periodic Table
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Materials Needed Today
Please take these materials out of your backpack.
•Pencil
•Blank sheet of paper for notes.
Hot Sync Monday 1/13/14
Answer the following questions in complete sentences on the hot sync worksheet.
Write out and choose which one is correct to finish the following sentence:
An atom is best described as…. • protons and electrons grouped together
in a random pattern • protons and electrons grouped together
in an alternating pattern • a core of protons and neutrons
surrounded by electrons • a core of electrons and neutrons
surrounded by protons
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JOKE OF THE DAY
In N Out
shake
waiter
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element
atomic number
mass number
isotope
average atomic mass
ion
4.3 Elements, Isotopes, and Ions—How Atoms Differ
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Carbon
6
C 12.011
Determined by
the number of
protons.
Is the number of
protons in the
nucleus.
The number of
protons PLUS
Neutrons in the
nucleus
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Atomic Number and the Periodic Table (cont.)
4.3 Elements, Isotopes, and Ions—How Atoms Differ
Increasing atomic number
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Isotopes
• Atoms of the same element that have different numbers of neutrons are called isotopes.
4.3 Elements, Isotopes, and Ions—How Atoms Differ
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Isotopes (cont.)
• The average atomic mass of an element is the weighted average mass of the mixture of an element’s isotopes.
4.3 Elements, Isotopes, and Ions—How Atoms Differ
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Isotopes (cont.)
• Radioactive isotopes are unstable and break down releasing particles, radiation, and energy.
4.3 Elements, Isotopes, and Ions—How Atoms Differ
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Positive Ions— Losing Electrons
• An atom that has gained or lost an electron and is no longer neutral is called an ion.
• When an atom loses an electron, it has more protons than electrons.
• The atom has a positive charge and is called a positive ion.
4.3 Elements, Isotopes, and Ions—How Atoms Differ
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Negative Ions— Gaining Electrons
• When an atom gains an electron, it has more electrons than protons.
• The atom has a negative charge and is called a negative ion.
• Positive ions and negative ions attract each other and form compounds.
4.3 Elements, Isotopes, and Ions—How Atoms Differ
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Lesson 3 Review
The carbon element has several isotopes. How is carbon-14 different from carbon-13?
A Carbon-14 has a positive charge.
B Carbon-13 has a positive charge.
C Carbon-14 has one more neutron than carbon-13.
D Carbon-14 has one less neutron than carbon-13.
4.3 Elements, Isotopes, and Ions—How Atoms Differ
A B C D
0% 0%0%0%
1. A
2. B
3. C
4. D
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Lesson 3 Review
What is the number of protons in an element called?
A isotope
B atomic number
C atomic mass
D radiotope
4.3 Elements, Isotopes, and Ions—How Atoms Differ
A B C D
0% 0%0%0%
1. A
2. B
3. C
4. D
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Lesson 3 Review
How does a neutral atom become a negative ion of the same element?
A It gains a proton.
B It loses a proton.
C It loses an electron.
D It gains an electron.
4.3 Elements, Isotopes, and Ions—How Atoms Differ
A B C D
0% 0%0%0%
1. A
2. B
3. C
4. D