Answer:
A. Compounds contain fixed ratios of different elements.
Explanation:
Water always has this 2:1 ratio of hydrogen to oxygen. Like water, all compounds consist of a fixed ratio of elements. It doesn't matter how much or how little of a compound there is. It always has the same composition.
I’m not 100% sure but I think it’s small
Elements in the first row (hydrogen and helium) will have outer electrons in the first energy level. Their principal quantum number is 1. Elements in the second row (lithium through neon) will have valence electrons in the second energy level with a principal quantum number of 2.
Answer:
<u>B</u><u>i</u><u>o</u><u>g</u><u>e</u><u>o</u><u>g</u><u>r</u><u>a</u><u>p</u><u>h</u><u>y</u><u> </u>is the study of past and present ....
..... such analysis
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