Name ________________
Atomic Radius
Date:_________________
1. As atomic number increases within Group 15 on the Periodic Table, atomic radius
1) decreases, only
2) increases, only
3) decreases, then increases
4) increases, then decreases
2. Considered in succession, the elements in Period 2 of the Periodic Table show a decrease in atomic radius
with increasing atomic number. This may best be explained by the fact that the
1) nuclear charge increases
2) number of electron shells increases
3) number of neutrons decreases
4) number of protons decreases
3. As the elements of Group 17 are considered in order of increasing atomic number, there is an increase in
1) atomic radius
2) electronegativity
3) first ionization energy
4) number of electrons in the first shell
4. An atom of which element has the largest atomic radius?
1) Fe
2) Mg
3) Si
4) Zn
5. As each successive element in Group 15 of the Periodic Table is considered in order of increasing atomic
number, the atomic radius
1) decreases
2) increases
3) remains the same
6. Which grouping of circles, when considered in order from the top to the bottom, best represents the relative
size of the atoms of Li, Na, K, and Rb, respectively?
1)
2)
3)
4)
7. As the elements of Group 16 are considered in order from top to bottom, the covalent radius of each
successive element increases. This increase is primarily due to an increase in
1)
2)
3)
4)
atomic number
mass number
the number of protons occupying the nucleus
the number of occupied electron shells
8. As the elements in Period 2 of the Periodic Table are considered in succession from left to right, there is a
decrease in atomic radius with increasing atomic number. This may best be explained by the fact that the
1)
2)
3)
4)
number of protons increases, and the number of shells of electrons remains the same
number of protons increases, and the number of shells of electrons increases
number of protons decreases, and the number of shells of electrons remains the same
number of protons decreases, and the number of shells of electrons increases
9. Which list of elements from Group 2 on the Periodic Table is arranged in order of increasing atomic radius?
1) Be, Mg, Ca
2) Ca, Mg, Be
3) Ba, Ra, Sr
4) Sr, Ra, Ba
Chemistry!
Atomic Radius
10. Which statement best compares the atomic radius of a potassium atom and the atomic radius of a calcium
atom?
1)
2)
3)
4)
The radius of the potassium atom is smaller because of its smaller nuclear charge.
The radius of the potassium atom is smaller because of its larger nuclear charge.
The radius of the potassium atom is larger because of its smaller nuclear charge.
The radius of the potassium atom is larger because of its larger nuclear charge.
11. Which of the following electron configurations represents the element with the smallest atomic radius?
1) 2-4
2) 2-5
3) 2-6
4) 2-7
12. Atoms of which of the following elements have the smallest atomic radius?
1) Si
2) P
3) S
4) Cl
13. Compared to a neon atom, a helium atom has a
1) smaller radius
2) smaller first ionization energy
3) larger atomic number
4) greater number of electrons
14. Compared to the atomic radius of a sodium atom, the atomic radius of a magnesium atom is smaller. The
smaller radius is primarily a result of the magnesium atom having
1) a larger nuclear charge
2) a smaller nuclear charge
3) more principal energy levels
4) fewer principal energy levels
15. Which element in Period 3 has the largest atomic radius?
1) Cl
2) Al
3) Na
4) P
16. Which element has atoms with the largest atomic radius?
1) Rb
2) Cs
3) Sr
4) Ba
17. Which of the following elements has the smallest atomic radius?
1) nickel
2) cobalt
3) calcium
4) potassium
18. Which of the following atoms has the largest atomic radius?
1) Na
2) K
3) Mg
4) Ca
19. Which sequence of elements is arranged in order of decreasing atomic radii?
1) Al, Si, P
2) Li, Na, K
3) Cl, Br, I
4) N, C, B
20. Which electron configuration represents the atom with the largest atomic radius?
1) 1
2) 2-1
3) 2-2
4) 2-3
Chemistry!
Answer Key
Per
1.
2
2.
1
3.
1
4.
2
5.
2
6.
1
7.
4
8.
1
9.
1
10.
3
11.
4
12.
4
13.
1
14.
1
15.
3
16.
2
17.
1
18.
2
19.
1
20.
2
Chemistry!