| Atomic symbol | Atomic Number | Protons | Neutrons | Electrons | Atomic mass |

Question

|---------------|---------------|---------|----------|-----------|-------------|
| No | __ | __ | __ | __ | 261 |

Answer 1

The element you're referring to is Nobelium, which has the following characteristics:

• Atomic Symbol: No
• Atomic Number: 102
• Protons: 102
• Neutrons: Approximately 159 (since atomic mass is 261, and atomic mass ≈ protons + neutrons; 261 - 102 = 159)
• Electrons: 102 (in a neutral atom, the number of electrons equals the number of protons)
• Atomic Mass: 261

So, the completed information would be:

| Atomic symbol | Atomic Number | Protons | Neutrons | Electrons | Atomic mass | |---------------|---------------|---------|----------|-----------|-------------| | No | 102 | 102 | 159 | 102 | 261 |