Answer:
double replacement occurs
Im pretty sure its the last one
Answer:
extensive property
Explanation:
Length is in extensive properties because they change depending on how much of the matter you have.
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Have 7 valence electrons, allowing them to more easily achieve an octet of electrons and become stable.
Answer: BeO
Explanation:
percent by mass of oxygen
percent by mass of oxygen in BeO
percent by mass of oxygen in MgO
percent by mass of oxygen in CaO
percent by mass of oxygen in SrO