a. 12
b. 12
c. 12
d. 13
e. 12
f. 14
#7:
An electron is about 1/2000 the mass of a proton or neutron.
#8:
No, the element’s mass number alone is not
enough information to prove that the element exists because there is no way to
distinguish the amount of protons from just the mass number.
#9:
a. Period
b. Group
#10:
Sodium and potassium.
#2:
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