Francium has an atomic number of 87. Which of the following is the nuclear equation that represents the radioactive decay of francium-223 by alpha particle?
Lawrencium has an atomic number of 103. _____is the daughter isotope formed when lawrencium-262 emits a beta particle.
s
How long does it take for 10.0 g of a radioactive isotope to decay to 1.25 g if its half-life is 17.0 d?
15.0 d
51.0 d
17.0 d
71.0 d
30.0 d
If the half-life of tritium (hydrogen-3) is 12.3 y, how much of a 0.0666 g sample of tritium is present after 50.0 y?
8.93 Ã 10-3 g
9.83 Ã 10-3 g
3.98 Ã 10-3 g
8.39 Ã 10-3 g
8.93 Ã 10-3 g
Dubnium has an atomic number of 105. When dubnium-262 emits an alpha particle, _____ is the resulting daughter isotope.
It took 65.5 y for 30.0 g of a radioactive isotope to decay to 1.25 g. What is the half-life of this isotope?
14.3 y
3.14 y
4.13 y
13.4 y
31.4 y
The half-life of americium-241 is 432 y. If 2.00 g of americium-241 is present in a sample, what mass of americium-241 is present after 1,000.0 y?
0.0402 g
0.0204 g
0.204 g
0.402 g
0.420 g
Francium has an atomic number of 87. Which of the following is the nuclear equation that represents the radioactive decay of francium-223 by alpha particle?
Lawrencium has an atomic number of 103. _____is the daughter isotope formed when lawrencium-262 emits a beta particle.
s
How long does it take for 10.0 g of a radioactive isotope to decay to 1.25 g if its half-life is 17.0 d?
15.0 d |
51.0 d |
17.0 d |
71.0 d |
30.0 d |
If the half-life of tritium (hydrogen-3) is 12.3 y, how much of a 0.0666 g sample of tritium is present after 50.0 y?
8.93 Ã 10-3 g |
9.83 Ã 10-3 g |
3.98 Ã 10-3 g |
8.39 Ã 10-3 g |
8.93 Ã 10-3 g |
Dubnium has an atomic number of 105. When dubnium-262 emits an alpha particle, _____ is the resulting daughter isotope.
It took 65.5 y for 30.0 g of a radioactive isotope to decay to 1.25 g. What is the half-life of this isotope?
14.3 y |
3.14 y |
4.13 y |
13.4 y |
31.4 y |
The half-life of americium-241 is 432 y. If 2.00 g of americium-241 is present in a sample, what mass of americium-241 is present after 1,000.0 y?
0.0402 g |
0.0204 g |
0.204 g |
0.402 g |
0.420 g |