Chapter 4 Post Lecture HW Questions
and Answers
Identify the group or period that contains Li and Cs. - answer Group 1A
They're both in the first vertical column, meaning they'e in a group rather than a period
since a period would be a horizontal row.
Identify the group or period that begins with the element B. - answer Group 3A
Periods on the periodic table begin with elements in group 1A. Since B is not located in
group 1A, B must be at the beginning of a group. Because B is located in the 3rd (not
including transition elements) or 13th (including transition elements) column, it is the
element that begins group 3A, one of the groups of representative elements on the
periodic table.
Identify the group or period that contains the halogens - answer Group 7A
Certain groups of the periodic table have special names. The halogens are elements
located in group 7A. The newer system of assigning numbers to groups in the periodic
table refers to this group as group 17.
Identify the group or period that contains Al, P, and Cl. - answer Period 3
The elements Al, P, and Cl are all located in the same row, or period. The first period
contains only two elements: hydrogen and helium; period 2 is the only period that
contains the elements Al, P, and Cl.
an alkaline earth metal in period 3
EXPRESS AS CHEMICAL SYMBOL - answer Mg
Groups in the periodic table refer to the "columns." The alkaline earth metals are the
elements located in the second group, or column, from the left of the periodic table.
Periods are the "rows" of the periodic table. Even though the alkaline earth metals do
not have an element in the first period, you can count down the column starting from
period 2 to locate an element in a particular period.
group 5A (15), period 2
EXPRESS AS CHEMICAL SYMBOL - answer N
Groups in the periodic table refer to the columns. Periods are the rows of the periodic
table. Make sure you located the correct group and correct period for the element
described in this problem. Note that, in groups 2A to 7A (17), there are no elements in
, period 1. Therefore, the first element in each of these groups, or columns, is considered
in period 2 and the elements below them are in subsequent periods.
a noble gas in period 4
EXPRESS AS CHEMICAL SYMBOL - answer Kr
Groups in the periodic table refer to the columns. Periods are the rows of the periodic
table. Make sure you located the correct group and correct period for the element
described in this problem. Note that, in groups 2A to 7A (17), there are no elements in
period 1. Therefore, the first element in each of these groups, or columns, is considered
in period 2 and the elements below them are in subsequent period
a halogen in period 4
EXPRESS AS CHEMICAL SYMBOL - answer Br
Groups in the periodic table refer to the "columns." The halogens are the elements
located in group 7A (17), which is the second column from the right of the periodic table.
Periods are the "rows" of the periodic table. Even though the halogens do not have an
element in the first period, you can count down the column starting from period 2 to
locate an element in a particular period.
group 4A (14), period 2
EXPRESS AS CHEMICAL SYMBOL - answer C
Groups in the periodic table refer to the columns. Periods are the rows of the periodic
table. Make sure you located the correct group and correct period for the element
described in this problem. Note that, in groups 2A to 7A (17), there are no elements in
period 1. Therefore, the first element in each of these groups, or columns, is considered
in period 2 and the elements below them are in subsequent periods.
Identify the function of each of the following in the body:
It is a component of bone and is required for metabolic reactions. - It contributes to
growth of bones, teeth, and connective tissue and is needed for the immune system. - It
is needed for proper thyroid function. - Its is the most prevalent positive ion in fluids
outside cells, and it is needed for water balance, muscle contraction, and nerve
impulses. - answer Mg- It is a component of bone and is required for metabolic
reactions.
Zn- It contributes to growth of bones, teeth, and connective tissue and is needed for the
immune system.
I- It is needed for proper thyroid function.
Na- Its is the most prevalent positive ion in fluids outside cells, and it is needed for water
balance, muscle contraction, and nerve impulses.
Classify each as an alkali metal, an alkaline earth metal, a transition element, or a
halogen.
Na, I, Mg, Zn - answer Zn is a transition element Z n is a transition element..
