In the fifth period 5s, 5p and 5d shells are filled.

Answer

To determine whether the statement "In the fifth period 5s, 5p and 5d shells are filled" is true or false, we can analyze the electronic configurations of the elements in the fifth period of the periodic table.

### Step-by-Step Solution:

1. **Identify the Elements in the Fifth Period**:
- The fifth period of the periodic table contains 18 elements, starting from Rubidium (Rb) and ending with Xenon (Xe).

2. **Determine the Electronic Configuration**:
- The electronic configurations of the elements in the fifth period can be summarized as follows:
- **Rubidium (Rb)**: [Kr] 5s¹
- **Strontium (Sr)**: [Kr] 5s²
- **Yttrium (Y)**: [Kr] 4d¹ 5s²
- **Zirconium (Zr)**: [Kr] 4d² 5s²
- **Niobium (Nb)**: [Kr] 4d⁴ 5s²
- **Molybdenum (Mo)**: [Kr] 4d⁵ 5s²
- **Technetium (Tc)**: [Kr] 4d⁷ 5s²
- **Ruthenium (Ru)**: [Kr] 4d⁸ 5s²
- **Rhodium (Rh)**: [Kr] 4d⁹ 5s²
- **Palladium (Pd)**: [Kr] 4d¹⁰
- **Silver (Ag)**: [Kr] 4d¹⁰ 5s¹
- **Cadmium (Cd)**: [Kr] 4d¹⁰ 5s²
- **Indium (In)**: [Kr] 4d¹⁰ 5s² 5p¹
- **Tin (Sn)**: [Kr] 4d¹⁰ 5s² 5p²
- **Antimony (Sb)**: [Kr] 4d¹⁰ 5s² 5p³
- **Tellurium (Te)**: [Kr] 4d¹⁰ 5s² 5p⁴
- **Iodine (I)**: [Kr] 4d¹⁰ 5s² 5p⁵
- **Xenon (Xe)**: [Kr] 4d¹⁰ 5s² 5p⁶

3. **Analyze the Filling Order**:
- According to the Aufbau principle, the order of filling the orbitals is 5s, 4d, and then 5p.
- In the fifth period, the 5s orbital is filled first, followed by the 4d orbitals, and finally the 5p orbitals.

4. **Conclusion**:
- The 5d orbital is not filled in the fifth period; it starts filling in the sixth period.
- Therefore, the statement "In the fifth period 5s, 5p and 5d shells are filled" is **false**.

### Final Answer:
The statement is **false** because the 5d shell is not filled in the fifth period.