Periodic Table of Elements
Np - Neptunium
Neptunium Menu
- Neptunium Page One
- Neptunium Page Two
Nuclides / Isotopes
| Nuc- lide | Atomic Mass | NN | Abun % | Spin | Half Life | DM | DT | BR % | Decay Energy (MeV) |
|---|---|---|---|---|---|---|---|---|---|
| Np225 | 225.0339 | 132 | Syn | 6ms | |||||
| Np226 | 226.0351 | 133 | Syn | 35ms |  | Pa222 | 8.200 | ||
| Np227 | 227.035 | 134 | Syn | 0.51s | | Pa223 | 7.816 | ||
| Np228 | 228.036 | 135 | Syn | 61.4s |  | U228 | 60 | 4.480 | |
| 61.4s | | Pa224 | 40 | 7.420 | |||||
| Np229 | 229.0362 | 136 | Syn | 4m | | Pa225 | >50 | 7.010 | |
| 4m | | U229 | <50 | 2.560 | |||||
| Np230 | 230.0378 | 137 | Syn | 4.6m | | U230 | <=97 | 3.610 | |
| 4.6m | | Pa226 | >=3 | 6.780 | |||||
| Np231 | 231.0382 | 138 | Syn | 5/2 | 48.8m | | U231 | 98 | 1.840 |
| 48.8m | | Pa227 | 2 | 6.370 | |||||
| Np232 | 232.04 | 139 | Syn | 4+ | 14.7m | | U232 | 2.700 | |
| Np233 | 233.0407 | 140 | Syn | 5/2+ | 36.2m | | Pa229 | 5.830 | |
| 36.2m | | U233 | 1.230 | ||||||
| Np234 | 234.0429 | 141 | Syn | 0+ | 4.4d | | U234 | 1.810 | |
| Np235 | 235.0441 | 142 | Syn | 5/2+ | 396.1d | | Pa231 | 0.0026 | 5.192 |
| 396.1d | | U235 | 0.124 | ||||||
| Np236 | 236.0466 | 143 | Syn | 6- | 154000y | | U236 | 87.30 | 0.940 |
| 154000y |  - | Pu236 | 12.50 | 0.940 | |||||
| 154000y | | Pa232 | 0.16 | 5.020 | |||||
| meta state 0.060MeV | Syn | 1 | 22.5h | | U236 | 52 | 1.000 | ||
| 22.5h | - | Pu236 | 48 | 0.550 | |||||
| Np237 | 237.0482 | 144 | Syn | 5/2+ | 2144000y | SF | <=2E -10 | ||
| 2144000y | | Pa233 | 4.959 | ||||||
| meta state 2.800MeV | Syn | 45ns | SF | <=100 | |||||
| Np238 | 238.0509 | 145 | Syn | 2+ | 2.117d | - | Pu238 | 1.292 | |
| Np239 | 239.0529 | 146 | Syn | 5/2+ | 2.3565d | - | Pu239 | 0.722 | |
| Np240 | 240.0562 | 147 | Syn | 5+ | 61.9m | - | Pu240 | 2.200 | |
| meta state 0.000MeV | Syn | 1+ | 7.22m | - | Pu240 | 99.89 | 2.200 | ||
| 7.22m | IT | ||||||||
| Np241 | 241.0582 | 148 | Syn | 5/2+ | 13.9m | - | Pu241 | 1.310 | |
| Np242 | 242.062 | 149 | Syn | 6 | 5.5m | - | Pu242 | 2.700 | |
| meta state 0.000MeV | Syn | 1+ | 2.2m | - | Pu242 | 2.700 | |||
| Np243 | 243.0643 | 150 | Syn | 5/2- | 1.8m | - | Pu243 | 2.170 | |
| Np244 | 244.068 | 151 | Syn | 7- | 2.29m | ||||
| Nuclide | Potential Parent Nuclides |
|---|---|
| Np225 | None known |
| Np226 | None known |
| Np227 | None known |
| Np228 | Am232 (Syn) |
| Np229 | None known |
| Np230 | Am233 (Syn) |
| Np231 | None known |
| Np232 | Am236 (Syn) Pu232 (Syn) |
| Np233 | Am237 (Syn) Pu233 (Syn) |
| Np234 | Am238 (Syn) Pu234 (Syn) |
| Np235 | Am239 (Syn) Pu235 (Syn) |
| Np236 | Am240 (Syn) |
| meta state 0.060MeV | None known |
| Np237 | Am241 (Syn) Pu237 (Syn) U237 (Syn) |
| meta state 2.800MeV | None known |
| Np238 | Am242m (Syn) Am242m1 (Syn) |
| Np239 | Am243 (Syn) U239 (Syn) |
| Np240 | U240 (Syn) |
| meta state 0.000MeV | None known |
| Np241 | None known |
| Np242 | U242 (Syn) |
| meta state 0.000MeV | None known |
| Np243 | None known |
| Np244 | None known |
Key:
| |
Neptunium Menu
- Neptunium Page One
- Neptunium Page Two
Related Resources
- Anatomy of the Atom
Answers many questions regarding the structure of atoms. - Molarity, Molality and Normality
Introduces stoichiometry and explains the differences between molarity, molality and normality. - Molar Mass Calculations and Javascript Calculator
Molar mass calculations are explained and there is a JavaScript calculator to aid calculations. - Chemical Database
This database focuses on the most common chemical compounds used in the home and industry.
Citing this page
If you need to cite this page, you can copy this text:
Kenneth Barbalace http://klbprouctions.com/. Periodic Table of Elements - Np - Neptunium. EnvironmentalChemistry.com. 1995 - 2009. Accessed on-line: 11/8/2009
http://EnvironmentalChemistry.com/yogi/periodic/Np.html
.
Linking to this page
If you would like to link to this page from your website, blog, etc., copy and paste this link code (in red) and modify it to suit your needs:
<a href="http://EnvironmentalChemistry.com/yogi/periodic/Np.html"> Periodic Table of Elements: Np - Neptunium (EnvironmentalChemistry.com)</a> - This page provides comprehensive nuclide information for the element element Np - Neptunium including: nuclide decay modes, half-life, branch ratios, decay energy, etc.
.
NOTICE: While linking to articles is encouraged, OUR ARTICLES MAY NOT BE COPIED TO OR REPUBLISHED ON ANOTHER WEBSITE UNDER ANY CIRCUMSTANCES.
PLEASE, if you like an article we published simply link to it on our website do not republish it.
Career Listings
Free Trade Magzines
Free Trade Magazine Subscriptions & Technical Document Downloads
Featured Articles
- Neurodevelopmental Disorders in Children: Autism & ADHD
- Nanotech-cleantech: bridging the gap to real sustainability
Go Green
- Redecorating
- Bathroom Renovation
- Switching to Renewable Energy
- Kitchen Renovation - Coming in 2010 or 2011
- Weatherization - Coming late 2009
Environmental Issues
- Consumer Health & Food Safety Concerns
- Energy & Sustainablity
- Environmental Disasters
- Politics and Policy
- Environmental Justice and the NIMBY Principle
- Prairie Dogs: Small mammal, big controversy
- Pseudoscience: A Threat to Our Environment
- Sorting out Science from Junk Science
- Pollution - Air
- Pollution - Water
- Waste & Recycling
Chemistry
- Articles
- Reference Resources
Hazardous Materials
- Household
- Industry
![[Icon of explosives placard]](http://EnvironmentalChemistry.com/images/placardthumbnail.gif)
USDOT HazMat Placards CD & training modulesEducators
This website is a great teaching resource!! Pages are printer friendly, making them easy to use as classroom handouts.
Notes about using this site in the classroom.
Advertise your web site on this page for $40 per year
Advertise your website on this page in this ad slot for $40 per year. Subject to site approval.
Syndication
NO REPUBLISHING IN ANY FORM (including on other websites), in whole or in part, for any reason, without written permission.
Copyright violations WILL BE DETECTED and will be pursued under the Digital Millennium Copyright Act.
A few words about Plagiarism, Copyright Infringement and Fair Use
Printed from http://EnvironmentalChemistry.com
