27 I think beacuse if you subtract
Explanation:
Atoms never gain protons; they become positively charge only by losing electrons. A positive ion is called a cation (pronounced: CAT-eye-on). You may have notice that the number of neutrons in each of these ions was not specified.
Substances that cannot be separated and found on a periodic table are elements.
Answer:
b. upper mantle
Explanation:
low velocity zone of the upper mantle
