When a + particle is emitted from an unstable nucleus, the atomic number of the nucleus
A) increases by 2.
B) does not change.
C) decreases by 2.
D) increases by 1.
E) decreases by 1.
Correct Answer:
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Q9: An atom's mass number is determined by
Q10: Isotopes of an element have nuclei with
A)
Q11: All isotopes are unstable which have proton
Q12: When an alpha particle is emitted from
Q13: When a neutron is emitted from an
Q15: Marie & Pierre Curie
A) discovered radioactivity.
B) proposed
Q16: Henri Becquerel
A) proposed the tiny central nucleus
Q17: Which isotopes are radioactive?
A) none
B) some
C) odd
Q18: When an alpha particle is emitted from
Q19: When a nucleus undergoes beta-minus decay, it
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