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Study
8th - Unit 1 Lesson 2 Periodic Table
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If an element has 11 protons, what is the element?
Sodium (Na)
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What are valence electrons?
The electrons in the outermost energy level of an atom
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Which element has the symbol K?
Potassium
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What number tells you how many protons are in an atom?
Atomic Number
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What does the atomic mass tell you?
Protons + neutrons
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What are the horizontal rows on the periodic table called?
Periods
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How many periods are there on the periodic table?
7
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What happens to atomic number as you move left to right across a period?
It goes up by 1.
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Where are the nonmetals found?
on the right side
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What is the atomic mass of Carbon (C)?
12.01
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What group contains the most reactive metals?
Group 1 Alkali Metals
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Which element has atomic number 26 and is known as a strong metal used in construction?
Iron
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Which element is in Period 3, Group 16?
Sulfur
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An element with 8 protons belongs to which period and group?
Period 2, Group 16 (Oxygen)
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What happens to reactivity of metals across a period?
It decreases
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What does the period number tell you?
How many energy levels (shells) the atom has.
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Which side of the periodic table are metals found on?
Left Side
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What are the vertical columns called?
Groups/Families
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Who created the first periodic table?
Dmitri Mendeleev
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What is the smallest particle of an element that still has the properties of that element?
Atom
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