How many neutrons does an atom of Dubnium have in its nucleus

Dubnium is a synthetic element ... Number 105. It can be created

in a laboratory but it's not found in nature.

Fifteen (15) different isotopes of Dubnium have been created. They all

have 105 protons in the nucleus of every atom, but they have anywhere

from 256 to 270 neutrons in each nucleus.

The most stable isotope of Dubnium is ²⁶⁸Db, with 163 neutrons in the

nucleus. That form of Dubnium atom has a 50-50 chance of surviving

for around 28 hours before it falls apart.