Answer:
chemical reactions are: the combination of elements to form compounds, the ... Equations may be expressed in words: Mercury(II) oxide decomposes to mercury and oxygen. ... The arrow ( ) means "reacts to form" or "yields.
Explanation:
If a carbon atom can form four covalent bonds, it also has four valence electrons. For neutral atoms, the number of valence electrons the same as an atom's main group number.
(3) because the 3 on the outside of the sulfate ion tells you that the first element has 3 valence electrons.
The correct answer is: [C]: " mg " {"milligrams"} .
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Answer:
8
Explanation:
look at the periodic table find sulfur then count what level is it on by rows