Questions: Using only the periodic table arrange the following elements in order of increasing atomic radius: neon, beryllium, fluorine, lithium Smallest Largest

Using only the periodic table arrange the following elements in order of increasing atomic radius: neon, beryllium, fluorine, lithium Smallest Largest
Transcript text: Using only the periodic table arrange the following elements in order of increasing atomic radius: neon, beryllium, fluorine, lithium Smallest $\square$ $\square$ $\square$ Largest $\square$
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Solution

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Solution Steps

Step 1: Understand Atomic Radius Trends in the Periodic Table

The atomic radius generally increases as you move down a group in the periodic table and decreases as you move across a period from left to right. This is because additional electron shells are added as you move down a group, increasing the size of the atom. Conversely, as you move across a period, the increasing nuclear charge pulls the electron cloud closer to the nucleus, reducing the atomic radius.

Step 2: Identify the Position of Each Element
  • Neon (Ne): Located in Group 18, Period 2.
  • Beryllium (Be): Located in Group 2, Period 2.
  • Fluorine (F): Located in Group 17, Period 2.
  • Lithium (Li): Located in Group 1, Period 2.
Step 3: Arrange Elements by Atomic Radius

All the elements are in Period 2, so we compare them based on their group number:

  • Lithium (Li): Group 1, largest atomic radius in this set.
  • Beryllium (Be): Group 2, smaller than Li.
  • Fluorine (F): Group 17, smaller than Be.
  • Neon (Ne): Group 18, smallest atomic radius in this set.

Final Answer

\[ \text{Smallest: Neon, Fluorine, Beryllium, Lithium} \] \[ \boxed{\text{Smallest: Ne, F, Be}} \] \[ \boxed{\text{Largest: Li}} \]

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