If the atomic number of an element is 9 and the mass number is 19,how many neutrons does the atom have?
A) 10
B) 9
C) 19
D) 28
Correct Answer:
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Q5: Atoms with more than one shell are
Q6: Which subatomic particle determines the chemical activity
Q7: The positively charged particles in the nucleus
Q8: The smallest unit of matter is the
A)molecule.
B)atom.
C)compound.
D)isotope.
Q9: The atomic mass of a proton is
A)0
Q11: Which is characteristic of an ion?
A)Contains an
Q12: Compared to "regular" isotopes,radioactive isotopes
A)emit energy from
Q13: What makes an isotope radioactive?
A)It has more
Q14: Which of the following subatomic particles are
Q15: Which subatomic particle determines the identity of
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