2. The ionization energy of an element is defined as the amount of energy required to remove an electron from an individual atom. The following table gives the ionization energy (in units of kilojoules per mole) for five metals, listed in alphabetical order. Locate each of these metals on the periodic table and arrange them in order of rows and columns as in the periodic table. (a) Describe the periodic trend in the ionization energy of elements within a group. (b) Describe the periodic trend in the ionization energy of elements across a period. Metal Calcium Magnesium Potassium Sodium Strontium Ionization Energy 590 738 419 496 549 laterials

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### Ionization Energy of Elements

**Definition:**
The ionization energy of an element is defined as the amount of energy required to remove an electron from an individual atom. The following table provides the ionization energy (in units of kilojoules per mole) for five metals, listed in alphabetical order.

**Objective:**
Locate each of these metals on the periodic table and arrange them in order of rows and columns as in the periodic table.

**Tasks:**

(a) **Describe the periodic trend in the ionization energy of elements within a group.**

(b) **Describe the periodic trend in the ionization energy of elements across a period.**

**Ionization Energy Table:**

| Metal      | Ionization Energy (kJ/mol) |
|------------|-----------------------------|
| Calcium    | 590                         |
| Magnesium  | 738                         |
| Potassium  | 419                         |
| Sodium     | 496                         |
| Strontium  | 549                         |

### Analysis:

- **Within a group**: Generally, ionization energy decreases as you move down a group in the periodic table. This is because the outer electrons are farther from the nucleus and are shielded by more inner electron shells.

- **Across a period**: Typically, ionization energy increases as you move across a period from left to right. This is due to increasing nuclear charge with each successive element, pulling electrons closer and making them harder to remove.

### Further Exploration:

Locate these metals on the periodic table to observe their positions and relation to these trends in ionization energy.
Transcribed Image Text:### Ionization Energy of Elements **Definition:** The ionization energy of an element is defined as the amount of energy required to remove an electron from an individual atom. The following table provides the ionization energy (in units of kilojoules per mole) for five metals, listed in alphabetical order. **Objective:** Locate each of these metals on the periodic table and arrange them in order of rows and columns as in the periodic table. **Tasks:** (a) **Describe the periodic trend in the ionization energy of elements within a group.** (b) **Describe the periodic trend in the ionization energy of elements across a period.** **Ionization Energy Table:** | Metal | Ionization Energy (kJ/mol) | |------------|-----------------------------| | Calcium | 590 | | Magnesium | 738 | | Potassium | 419 | | Sodium | 496 | | Strontium | 549 | ### Analysis: - **Within a group**: Generally, ionization energy decreases as you move down a group in the periodic table. This is because the outer electrons are farther from the nucleus and are shielded by more inner electron shells. - **Across a period**: Typically, ionization energy increases as you move across a period from left to right. This is due to increasing nuclear charge with each successive element, pulling electrons closer and making them harder to remove. ### Further Exploration: Locate these metals on the periodic table to observe their positions and relation to these trends in ionization energy.
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