Question

what element does the symbol o stand for?
what is the symbol for iron?
how many protons are there in an oxygen atom?
how many more protons are there in an oxygen atom than a hydrogen atom?
how many more protons are there in an atom of iron than in an atom of oxygen?
approximately how much more mass does oxygen have than hydrogen?

Explanation:

1. The element symbol O corresponds to Oxygen, as shown in the provided periodic table tile.
2. The periodic table tile for Iron shows its symbol is Fe.
3. The atomic number (top left of the tile) equals the number of protons; oxygen's atomic number is 8.
4. Hydrogen has 1 proton, oxygen has 8. Subtract to find the difference: $8-1=7$.
5. Iron has 26 protons, oxygen has 8. Subtract to find the difference: $26-8=18$.
6. Oxygen's atomic mass is ~15.99, hydrogen's is ~1.01. Subtract to find the difference: $15.99-1.01=14.98$, which approximates to 15.

Answer:

1. Oxygen
2. Fe
3. 8
4. 7
5. 18
6. Approximately 15 (or 14.98)