Grade 10 · Science · Chemistry

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

6 printable versionsBuilding Confidence10 questions · answer keyFree · no account

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Atomic and ionic size across the periodic table

Grade 10 Science Worksheet - Building Confidence

NameDate

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

Sodium's atomic radius is 180 pm and magnesium's is 150 pm (Slater). How many pm smaller is magnesium, Ari?
Magnesium's atomic radius is 150 pm and aluminum's is 125 pm (Slater). How many pm smaller is aluminum, Bo?
Aluminum's atomic radius is 125 pm and silicon's is 110 pm (Slater). How many pm smaller is silicon, Esme?
4.
Using the table, which atom is largest, Jun?
- Cesium
- Silicon
- Sodium
5.
Using the table, what happens to radius across period 3, Kira?
Use the picture in question 4.
- It shrinks
- It grows
- It stays the same
6.
Chlorine and sodium both use shell 3. Why is chlorine smaller, Noah?
- It has fewer shells
- Its 17 protons pull harder
- Its extra electrons make it bigger
7.
How many shells do the atoms across period 3 have, Pia?
- One more each step
- Eight each
- Three each
8.
Why do atoms get larger down a group, Ren?
- Each adds a new shell
- Their nuclei swell up in size
- Each loses protons
9.
Why is potassium larger than sodium, Tala?
- It has fewer protons inside
- It is a gas
- It has one more shell
10.
In a larger atom, where are the outer electrons, Zee?
- Inside the nucleus
- Farther from the nucleus
- Closer to the nucleus

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.

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