## How many neutrons does uranium-238 have?

146 neutrons

The most stable isotope of uranium, U-238, has an atomic number of 92 (protons) and an atomic weight of 238 (92 protons plus 146 neutrons).

**What isotope has 143 neutrons?**

uranium

U-238 and U-235 (which has 143 neutrons) are the most common isotopes of uranium. Uranium naturally contains all three isotopes (U-238, U-235 and U-234), and it rarely varies more than 0.01% from the average composition shown in the table below without our intervention.

### How many neutrons does magnesium have?

The most common and stable type of magnesium atom found in nature has 12 protons, 12 neutrons, and 12 electrons (which have a negative charge). Atoms of the same element with different neutron counts are known as isotopes.

**Does uranium have 142 neutrons?**

Uranium is an element and it is made of 92 protons, 92 electrons and 142 neutrons.

## What is the mass of uranium 238?

238.05078826 u

Uranium-238

General | |
---|---|

Half-life | 4.468 billion years |

Parent isotopes | 242Pu (α) 238Pa (β−) |

Decay products | 234Th |

Isotope mass | 238.05078826 u |

**How many neutrons does uranium 239 have?**

Therefore, it has 92 protons, 92 electrons, and 238 — 92 : 146 neutrons.

### What is the mass number of a uranium atom that has 143 neutrons in it?

Uranium-235… The difference between U-238 and U-235 is that U-238 has 146 neutrons (146 neutrons + 92 protons = 238 number of mass), while U-235 has 143 neutrons (143 neutrons + 92 protons = 235 number of mass).

**How many neutrons does magnesium 30?**

List of isotopes

Nuclide | Z | N |
---|---|---|

30Mg | 12 | 18 |

31Mg | 12 | 19 |

32Mg | 12 | 20 |

## How many neutrons does magnesium 25 have?

They differ only because a 24Mg atom has 12 neutrons in its nucleus, a 25Mg atom has 13 neutrons, and a 26Mg has 14 neutrons. Figure 2.3.

**Is uranium-239 fissile?**

upon absorbing a neutron, forms uranium-239, and this latter isotope eventually decays into plutonium-239—a fissile material of great importance in nuclear power and nuclear weapons.

### What are the molar mass of uranium-238 and uranium 235?

Answer: The molar mass of U-238 is 238 g/mol and U-235 IS 235g/mol.

**What are the mass and neutron numbers of uranium?**

The chemical symbol for Uranium is U. Mass numbers of typical isotopes of Uranium are 238, 235. The total number of neutrons in the nucleus of an atom is called the neutron number of the atom and is given the symbol N. Neutron number plus atomic number equals atomic mass number: N+Z=A.

## What makes uranium 235 lighter than uranium 238?

These isotopes show similar chemistry but differ in physical properties and nuclear reactivity. Uranium-235. Uranium 235 is the second most abundant isotope and makes up to nearly 0.7% of the earth’s Uranium content. A nucleus of this contains 92 protons and 143 neutrons: 3 neutrons less than the U-238 which makes it slightly lighter.

**Which is more likely to Fission Uranium 238 or 233?**

Uranium-238 has a small probability for spontaneous fission or even induced fission with fast neutrons; uranium-235 and to a lesser degree uranium-233 have a much higher fission cross-section for slow neutrons. In sufficient concentration, these isotopes maintain a sustained nuclear chain reaction.

### What is the half life of uranium 238?

Its half-life is about 4.5 billion years, which indicates very slow nuclear activity. Nuclear fission reaction is slower in U-238. However, it is able to capture a neutron, perform 2 beta decays and become Plutonium-239 which can readily undergo fission.

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