Atomic and ionic size across the periodic table
Grade 10 Science Worksheet - Building Confidence
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?
Using the table, which atom is largest, Jun?
- Cesium
- Sodium
- Silicon
Using the table, what happens to radius across period 3, Kira?
Use the picture in question 4.
- It grows
- It shrinks
- It stays the same
Why do atoms get smaller across a period, Milo?
- They lose shells
- More protons pull the same shell in
- They gain electrons and swell outward
Chlorine and sodium both use shell 3. Why is chlorine smaller, Noah?
- It has fewer shells
- Its extra electrons make it bigger
- Its 17 protons pull harder
How many shells do the atoms across period 3 have, Pia?
- Eight each
- One more each step
- Three each
Why do atoms get larger down a group, Ren?
- Each adds a new shell
- Their nuclei swell up in size
- Each loses protons
Why is potassium larger than sodium, Tala?
- It has fewer protons inside
- It has one more shell
- It is a gas