A vapor is which state of matter?
C. Gas.
Cadium
Down a period, atomic radii decrease from left to right due to the increase in the number of protons and electrons across a period.
<span>2 HCl + Ba(OH)2 = BaCl2 + 2 H2O is the answer.</span>
The answer is A.
Pure substance is either an element or a compound, which elements in compund is chemically combined together. They cannot be separated by physical methods such as filtration or evaporation. Compounds can only be separated by chemical methods, which include using electricity (electrolysis) or applying heat.