Answer:
A atom is a small unit to which matter can be divided without releasing electrically charged particles
Explanation:
Its arbitrary. It was developed on the greek phoenetic system and never reallybwas explained.
The metals are to the left of the line (except for hydrogen, which is a nonmetal), the nonmetals are to the right of the line, and the elements immediately adjacent to the line are the metalloids.
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Answer:
A chemical change occurs when the reactants chemical compositions have changed
Explanation:
a change in colour, change in temperature, change in smell, formation of a precipitate, or the formation of gas bubbles
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