Answer:
1 oxygen 1 hydrogen hydrogen peroxide I think
Something that can not be undone. Like baking bread..cant be undone.
Corresponding in size or amount to something else.
Answer:
moving across te periodic table electronegativity increases.
Explanation:
as we move across a period the effective nuclear charge increases as the number of protons in nucleus increases. due to increase in effective nuclear charge electronegativity increases
