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| Name of Element | Element Symbol | Mass Number | Atomic Number | Protons | Neutrons | Electrons |

|------------------|----------------|-------------|---------------|---------|----------|-----------|
| Thallium | TI | 204 | 81 | __ | __ | __ |

1 answer

To fill in the missing values for Thallium (Tl) based on the given mass number and atomic number:

  1. Protons: The atomic number is the number of protons in an element. For Thallium (Tl), the atomic number is 81. Therefore, the number of protons is 81.

  2. Neutrons: The number of neutrons can be calculated using the formula: \[ \text{Neutrons} = \text{Mass Number} - \text{Protons} \] So, for Thallium: \[ \text{Neutrons} = 204 - 81 = 123 \]

  3. Electrons: In a neutral atom, the number of electrons is equal to the number of protons. Since Thallium has 81 protons, it also has 81 electrons.

Now, we can fill in the table:

| Name of Element | Element Symbol | Mass Number | Atomic Number | Protons | Neutrons | Electrons | |------------------|----------------|-------------|---------------|---------|----------|-----------| | Thallium | Tl | 204 | 81 | 81 | 123 | 81 |