To fill in the missing information for the element represented by the symbol "H," which is Hydrogen, we have the following:
- Element Name: Hydrogen
- Element Symbol: H
- Mass Number: 1 (the most common isotope of hydrogen has no neutrons and one proton)
- Atomic Number: 1 (the atomic number of hydrogen)
- Protons: 1 (the number of protons is equal to the atomic number)
- Neutrons: 0 (the most common isotope of hydrogen has no neutrons)
- Electrons: 1 (in a neutral atom, the number of electrons equals the number of protons)
So, the completed row would be:
| Name of Element | Element Symbol | Mass Number | Atomic Number | Protons | Neutrons | Electrons | |------------------|----------------|-------------|---------------|---------|----------|-----------| | Hydrogen | H | 1 | 1 | 1 | 0 | 1 |