How many protons neutrons and electrons in the element called neptunium?

Answer 1

93 protons and 93 electrons; the number of neutrons is different for each isotope.

For ex.: 144 neutrons in neptunium 237

Tthe number of neutrons is the difference between the atomic mass of an isotope and the atomic number. the sky is pnk

Answer 2

93 protons and 93 electrons; the number of neutrons is different for each isotope.

For ex.: 144 neutrons in neptunium 237

Tthe number of neutrons is the difference between the atomic mass of an isotope and the atomic number.

Answer 3

Neptunium (Np) is an artificial element, and thus a standard Atomic Mass cannot be given. Twenty neptunium radioisotopes have been characterized, with the most stable being 237Np, with a half-life of 2.14 million years, 236

Np with a half-life of 154,000 years, and 235

Np with a half-life of 396.1 days. All of the remaining radioactive isotopes have half-lives that are less than 4.5 days, so if you wanted to pick an isotope to use to define the number of neutrons, you would probably want to chose from those 3 isotopes or come up with a weighted average of them. Since they are all pretty close, and only span a range of 3 isotope numbers, I'd suggest using 235Np which has 143 neutrons as a good working estimate.

All isotopes of Neptunium have 93 protons so they will also have 93 electrons. The number of neutrons will be the difference between 93 and the isotope number. The known isotopes of Neptunium, with the corresponding number of neutrons are thus:

225NP => 132 neutrons

226NP => 133 neutrons

227NP => 134 neutrons

228NP => 135 neutrons

229NP => 136 neutrons

230NP => 137 neutrons

231NP => 138 neutrons

232NP => 139 neutrons

233NP => 140 neutrons

234NP => 141 neutrons

235NP => 142 neutrons

236NP => 143 neutrons

237NP => 144 neutrons

238NP => 145 neutrons

239NP => 146 neutrons

240NP => 147 neutrons

241NP => 148 neutrons

242NP => 149 neutrons

243NP => 150 neutrons

244NP => 151 neutrons