Practice Exercises (3.9) - Classification of Elements and Periodicity in Properties

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6 sample questions

Question 1.
What is the atomic number?
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It determines the element's identity.
Question 2.
What element is placed below hydrogen in the Periodic Table?
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It is the first alkali metal.
3Question 3.
What does the Periodic Table arrange elements by?
- Atomic weight
- Atomic number
- Mendeleev's law
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Think about how elements are classified today.
4Question 4.
True or False: Mendeleev's Periodic Table was the first to use atomic numbers as a basis for arrangement.
- True
- False
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Consider the early discussions on atomic structure.
Question 5.
Using the Periodic Table, determine the properties of an unknown element with atomic number 98 and describe its likely behavior in reactions.
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Look at its position and group tendencies.
Question 6.
Evaluate how the modern Periodic Law changed from Mendeleev’s law to impact classifications today.
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Consider the benefit of knowing the true structure of elements.

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