Part A What is the accepted explanation for why the atomic radius of the represe
ID: 965500 • Letter: P
Question
Part A
What is the accepted explanation for why the atomic radius of the representative elements decreases as you move from left to right across a period?
There are more electrons on the atoms as you move from left to right.
There are fewer electrons on the atoms as you move from left to right.
The effective nuclear charge experienced by the outermost electrons increases as you move from left to right.
The effective nuclear charge experienced by the outermost electrons decreases as you move from left to right.
The uncertainty in the electron's position decreases as you move from left to right.
The uncertainty in the electron's position increases as you move from left to right.
Part B
Which ion below has the largest radius?
Cl-
K+
Na+
Br-
Part C
For the atom of an element, which of the following would be larger?
atomic radius
van der Waals radius
Neither, they are the same
There are more electrons on the atoms as you move from left to right.
There are fewer electrons on the atoms as you move from left to right.
The effective nuclear charge experienced by the outermost electrons increases as you move from left to right.
The effective nuclear charge experienced by the outermost electrons decreases as you move from left to right.
The uncertainty in the electron's position decreases as you move from left to right.
The uncertainty in the electron's position increases as you move from left to right.
Part B
Which ion below has the largest radius?
Cl-
K+
Na+
Br-
Part C
For the atom of an element, which of the following would be larger?
atomic radius
van der Waals radius
Neither, they are the same
Explanation / Answer
a)
The effective nuclear charge experienced by the outermost electrons decreases as you move from left to right.
since there is more distance and more charge, then the charge is less; therefore larger
b)
Largest radius is given by negative ions, and large ions
then choose Br over Cl
c)
they are the same, since they are based on the same definition