Periodic Trends Practice

8 problems · instant feedback · full explanations

Periodic trends let you predict properties without memorizing every element. These eight problems test the three big trends — atomic radius, ionization energy, and electronegativity — and the reasoning behind each.

Q1.
Atomic radius generally increases when you move:

Multiple choice · Easy

Q2.
Which element is the most electronegative?

Multiple choice · Easy

Q3.
First ionization energy generally increases across a period from left to right.

True / False · Easy

Q4.
Which has the largest atomic radius: Na, Mg, Al, or Si?

Multiple choice · Medium

Q5.
Which has the highest first ionization energy: Li, Be, B, or C?

Multiple choice · Hard

Q6.
Fluorine is more electronegative than chlorine.

True / False · Easy

Q7.
Which ion is smallest: Na+, Mg2+, or Al3+?

Multiple choice · Medium

Q8.
Alkali metal reactivity increases down the group. Which is most reactive: Li, Na, or K?

Multiple choice · Easy

Periodic Trends Practice

Q1. Atomic radius generally increases when you move:

Q2. Which element is the most electronegative?

Q3. First ionization energy generally increases across a period from left to right.

Q4. Which has the largest atomic radius: Na, Mg, Al, or Si?

Q5. Which has the highest first ionization energy: Li, Be, B, or C?

Q6. Fluorine is more electronegative than chlorine.

Q7. Which ion is smallest: Na+, Mg2+, or Al3+?

Q8. Alkali metal reactivity increases down the group. Which is most reactive: Li, Na, or K?

Q1.
Atomic radius generally increases when you move:

Q2.
Which element is the most electronegative?

Q3.
First ionization energy generally increases across a period from left to right.

Q4.
Which has the largest atomic radius: Na, Mg, Al, or Si?

Q5.
Which has the highest first ionization energy: Li, Be, B, or C?

Q6.
Fluorine is more electronegative than chlorine.

Q7.
Which ion is smallest: Na+, Mg2+, or Al3+?

Q8.
Alkali metal reactivity increases down the group. Which is most reactive: Li, Na, or K?