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

Question

|------------------|----------------|-------------|---------------|---------|----------|-----------|
| ____ | Ba | __ | __ | __ | __ | 56 |

Answer 1

Based on the information provided, you want to fill in the missing spaces for the element Barium (Ba). Here’s the completed information:

| Name of Element | Element Symbol | Mass Number | Atomic Number | Protons | Neutrons | Electrons | |------------------|----------------|-------------|---------------|---------|----------|-----------| | Barium | Ba | 138 | 56 | 56 | 82 | 56 |

• The atomic number of Barium is 56, indicating it has 56 protons.
• The mass number of Barium is typically around 138, which is the sum of protons and neutrons (56 protons + 82 neutrons = 138).
• In a neutral atom, the number of electrons equals the number of protons, so Barium also has 56 electrons.

Therefore, the completed table reflects the standard isotopic composition of Barium.