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Constructed Response . Topic 2: The Periodic Table
Set A : Properties of Group, Periodic Law
Write your answers here
th
1. In the 19 century, Dmitri Mendeleev predicted the existence of 1.
a then unknown element X with a mass of 68. He also
predicted that an oxide of X would have the formula X2O.
On the modern Periodic Table, what is the Group number
and Period number of element X?
2. Explain, in terms of atomic structure, why the atomic radius 2.
of iodine is greater than the atomic radius of fluorine.
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3. Explain, in terms of electron configuration, why selenium 3.
and sulfur have similar chemical properties?
4. Base your answer to the following question on the 4.
information below
Given: Samples of Na, Ar, As, Rb.
Explain why Na and Rb share similar chemical characteristics.
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Set B: Reactivity of elements, Trend in atomic size, Periodic trend
Base your answers to question 5 and 6 on the following information.
Potassium is a mineral that appears in abundance in all living plant and animal cells.
The human body uses it to promote regular heartbeat, help build muscles, help
contract muscles, regulate blood pressure, and control the water balance in the
body tissues and cells.
Calcium is a mineral that primarily functions in your body by making your bones and
teeth hard. The rest is in your blood and soft tissues; it helps your muscles contract
and your blood clot, and helps your nervous system work properly
Write your answers here.
5. According to your knowledge of atomic structure, 5.
explain why the calcium atom is smaller than
potassium atom.
6. Potassium and calcium are rarely found as pure element 6.
in nature. They are usually combined with other
substances. Explain why this is so.
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 367
Set A : Properties of Group, Periodic Law
Write your answers here
th
1. In the 19 century, Dmitri Mendeleev predicted the existence of 1.
a then unknown element X with a mass of 68. He also
predicted that an oxide of X would have the formula X2O.
On the modern Periodic Table, what is the Group number
and Period number of element X?
2. Explain, in terms of atomic structure, why the atomic radius 2.
of iodine is greater than the atomic radius of fluorine.
Teacher Preview Copy
3. Explain, in terms of electron configuration, why selenium 3.
and sulfur have similar chemical properties?
4. Base your answer to the following question on the 4.
information below
Given: Samples of Na, Ar, As, Rb.
Explain why Na and Rb share similar chemical characteristics.
Teacher Preview Copy
Set B: Reactivity of elements, Trend in atomic size, Periodic trend
Base your answers to question 5 and 6 on the following information.
Potassium is a mineral that appears in abundance in all living plant and animal cells.
The human body uses it to promote regular heartbeat, help build muscles, help
contract muscles, regulate blood pressure, and control the water balance in the
body tissues and cells.
Calcium is a mineral that primarily functions in your body by making your bones and
teeth hard. The rest is in your blood and soft tissues; it helps your muscles contract
and your blood clot, and helps your nervous system work properly
Write your answers here.
5. According to your knowledge of atomic structure, 5.
explain why the calcium atom is smaller than
potassium atom.
6. Potassium and calcium are rarely found as pure element 6.
in nature. They are usually combined with other
substances. Explain why this is so.
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 367
