station 1\nunderstanding the periodic table\nif an atom of oxygen has an atomic number of 8, that means-\ne…
station 1\nunderstanding the periodic table\nif an atom of oxygen has an atomic number of 8, that means-\ne. there are 8 protons.\nf. there are 8 neutrons.\ng. it weighs 8 amu.\nh. it is in group 8.
Answer
Brief Explanations:
To solve this, we recall the definition of atomic number: the atomic number of an element is equal to the number of protons in its nucleus. For oxygen with atomic number 8:
- Option E: Atomic number = number of protons, so 8 protons is correct.
- Option F: Neutrons = Atomic mass - Atomic number (Oxygen's atomic mass is ~16, so neutrons ~8, but atomic number doesn't directly give neutrons, so F is wrong.
- Option G: Atomic mass (not atomic number) relates to amu; O's atomic mass is ~16, so G is wrong.
- Option H: Oxygen is in group 16 (or 6A), not group 8, so H is wrong.
Answer:
E. there are 8 protons.