In which case of these process is an element of matter changed into a completely different element?
a. nuclear fission
b. nuclear fusion
c. alpha decay
d. all of these
When U-235 (atomic number 92) undergoes fission, the two nuclei that result have a total of ________ protons.
a. 90
b. 91
c. 92
d. 93
Which of these atoms has the greatest amount of electrical charge in its nucleus?
a. helium
b. hydrogen
c. iron
d. uranium
A radioactive isotope of strontium, Sr, is especally dangerous to humans because it tends to accumulate in bone marrow tissues. How does ths relate to the organization of the periodic table?
a. Compared to calcium, strontium has an additional 18 electrons to cause harm.
b. Strontium and calcium are in the same atomic period; hence they have similar physical and chemical properties.
c. Strontium and calcium are in the same atomic group; hence they have similar physical and chemical properties.
d. Strontium is over twice as massive as calcium
1) d ; 2) c ; 3) d ; 4) c.
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