Grade 10 · Science · Chemistry

10th grade Atomic and ionic size across the periodic table worksheet

6 printable versionsOn Level10 questions · answer keyFree · no account

When it’s done, scan the sheet with your phone and PencilGo marks it and picks the next one. Create a free account

Version

Atomic and ionic size across the periodic table

Grade 10 Science Worksheet

NameDate

Circle the best answer, or write your answer on the line.

Cl⁻ has a radius of 181 pm and Na⁺ of 102 pm (Shannon). How many times larger is Cl⁻, to 0.01, Ari?
O²⁻ has a radius of 140 pm and Mg²⁺ of 72 pm (Shannon). How many times larger is O²⁻, to 0.01, Bo?
Cl⁻ has a radius of 181 pm and K⁺ of 138 pm (Shannon). How many times larger is Cl⁻, to 0.01, Esme?
Read this first
Ionic radii in pm (Shannon 1976, six-coordinate) (Shannon 1976)
ion electrons radius (pm)
O²⁻ 10 140
F⁻ 10 133
Na⁺ 10 102
Mg²⁺ 10 72
Cl⁻ 18 181
K⁺ 18 138
4.
Using the table, which ion is smallest, Jun?
- Cl⁻
- Mg²⁺
- O²⁻
5.
Using the table, why is Cl⁻ larger than F⁻, Kira?
- It has a bigger charge
- It has fewer protons
- It has one more shell
6.
Using the table, how does Na⁺ compare in size with F⁻, Luz?
- Na⁺ is smaller
- They are equal
- Na⁺ is larger
7.
Why is Na⁺ much smaller than a sodium atom, Milo?
- It has lost its outer shell
- It has lost protons
- It has gained a shell
8.
What happens to an atom's size when it loses electrons, Noah?
- It gets larger
- It gets smaller
- It stays the same
9.
Which is smaller, a magnesium atom or Mg²⁺, Pia?
- They are the same size
- Mg²⁺
- The magnesium atom
10.
What happens to an atom's size when it gains electrons, Tala?
- It gets smaller
- It disappears
- It gets larger

Atomic and ionic size across the periodic table. Every version has 10 questions, and the answer key prints on the second page.

I can say that atomic radius shrinks across a period (more protons pull the same shell) and grows down a group (more shells).
I can say that positive ions are smaller than their atoms and negative ions larger.
I can compare ions with the same number of electrons: more protons, smaller ion.
I can read radius tables and work out differences, ratios and percent growth.

Standard: HS-PS1-1

atomic radius: Half the distance between two bonded nuclei of an element

ionic radius: The size of an ion in a crystal

cation: A positive ion, smaller than its atom

anion: A negative ion, larger than its atom

picometer (pm): 10⁻¹² m

Your child added the radii. How much smaller one atom is than another is a difference: subtract.

Your child divided the smaller ion by the larger. To say how many times larger, divide the larger radius by the smaller.

Your child divided by the new radius. Percent growth compares with the starting size: (new − old) ÷ old × 100.

What is the most common mistake with atomic and ionic size across the periodic table?

Your child added the radii. How much smaller one atom is than another is a difference: subtract.

Are these 10th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

Every sheet you scan goes into your child’s record: dated, marked and ready for the year-end portfolio. Homeschool records