Atomic Number and Mass Number
Presentation
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Chemistry
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7th - 12th Grade
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Practice Problem
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Medium
Standards-aligned
K. Ford
Used 100+ times
FREE Resource
13 Slides • 13 Questions
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Atomic Number and Mass Number
physical science
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Multiple Choice
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Atomic Number
each element has its own atomic number that never changes
each element has a specific number of protons
Thorium's atomic number is 90, so ALL Thorium atoms will have 90 protons
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Multiple Choice
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Fill in the Blanks
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Multiple Choice
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Mass Number
the mass number of the previous example is 12
mass number is calculated by ADDING the number of protons and neutrons
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Multiple Choice
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Multiple Choice
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8 protons means atomic number = 8
16 - 8 = 8 neutrons
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Finding the number of electrons
REMEMBER: the overall charge of the atom is NEUTRAL
for this to be true, protons (+) and electrons (-) have to cancel each other out
therefore, 8 protons = 8 electrons
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Multiple Choice
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Multiple Choice
What is the atomic number of this element?
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Multiple Choice
How many protons will an atom of Silicon have?
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Multiple Choice
How many neutrons will an atom of Lithium have?
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Multiple Choice
How many electrons will there be in an atom of Manganese?
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Multiple Choice
Calculate the number of neutrons in an atom of Krypton.
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Multiple Choice
Atomic Number and Mass Number
physical science
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