It is b, i learned this last year hope this helps
Answer:
oxygen is an element because it is a pure substance which cannot be split into simpler substances by chemical means
Answer:
B.) Oxygen is usually -2
Explanation:
Hydrogen is usually +1.
A pure group 1 element is not always +1.
A monoatomic ion can be a range of numbers. However, it must be a charge other than 0.
