20 neutrons

17 electrons

How many protons electrons and neutrons are there in an atom of chlorine-37 quizlet?

The atomic number of chlorine is 17. Calculate the numbers of Protons, electrons, and neutrons each isotope has. Both isotopes have 17 protons and 17 electrons. Chlorine-35 has 18 neutron and chlorine-37 has 20 neutrons.

How many protons and electrons are in an atom of sodium whose atomic number is 11 quizlet?

Since all sodium atoms have 11 protons, this one has 11 protons. This tells us that it also has 11 electrons. Since the mass number is 23, we know that the sum of protons and neutrons in the nucleus must equal 23.

92 protons

Why is U-238 th 234?

A nucleus of uranium 238 decays by alpha emission to form a daughter nucleus, thorium 234. This thorium in turn transforms into protactinium 234, and then undergoes beta-negative decay to produce uranium 234.

Why is U-238 not used as a fuel?

The reason why Uranium 238 is not fissile is because upon absorption of a thermal neutron, the binding energy released by U-238 is not greater as compared to the critical energy required to carry out the fission.

Why is U-235 better than u-238?

U- 235 is a fissile isotope, meaning that it can split into smaller molecules when a lower-energy neutron is fired at it. U- 238 has an even mass, and odd nuclei are more fissile because the extra neutron adds energy – more than what is required to fission the resulting nucleus.

Why is U-238 more stable than U-235?

U-235 is less stable than U-238 because it has an odd number of neutrons (nuclei are more stable when their nucleons can pair up). Thus it has a shorter half life. Since enriched uranium has a higher concentration of U-235 than natural uranium, it is more radioactive.

What does uranium 238 look like?

Uranium-238 (238U or U-238) is the most common isotope of uranium found in nature, with a relative abundance of 99%. Unlike uranium-235, it is non-fissile, which means it cannot sustain a chain reaction in a thermal-neutron reactor….Uranium-238.

General
Symbol 238U
Names uranium-238, U-238
Protons 92
Neutrons 146

What’s the difference between uranium 235 and 238?

Uranium-235 and U-238 are chemically identical, but differ in their physical properties, notably their mass. The U-238 nucleus also has 92 protons but has 146 neutrons – three more than U-235 – and therefore has a mass of 238 units.

What happens when uranium-235 absorbs a neutron?

A uranium-235 atom absorbs a neutron and fissions into two new atoms (fission fragments), releasing three new neutrons and some binding energy. Both of those neutrons collide with uranium-235 atoms, each of which fissions and releases between one and three neutrons, which can then continue the reaction.

How dangerous is uranium-235?

Ingestion of high concentrations of uranium, however, can cause severe health effects, such as cancer of the bone or liver. Inhaling large concentrations of uranium can cause lung cancer from the exposure to alpha particles.

Can you touch uranium 235?

U-235, the more radioactive isotope used in enriched and weapons-grade uranium only accounts for about 0.7% of natural uranium ore. But even U-235 isn’t terribly dangerous from a radiation standpoint. The larger concern when handling these materials is their inherent toxicity.

What country has the most plutonium?

The largest stockpiles belonged to the United States with 502 tons of plutonium, Russia with 271 tons and France with 236 tons, according to the report. Stocks of civilian plutonium grow by 70 tons each year, according to the report.

Is plutonium used in bombs?

Plutonium-239 is a fissionable isotope and can be used to make a nuclear fission bomb similar to that produced with uranium-235. The bomb which was dropped at Nagasaki was a plutonium bomb. Not enough Pu-239 exists in nature to make a major weapons supply, but it is easily produced in breeder reactors.