Thorium has 90 protons.
Thorium's atomic number is 90. Thus, thorium has 90 protons per atom. To be electrically neutral then, thorium must also have 90 electrons per atom.
Thorium has 90 protons. It does not matter which isotope is involved.
Thorium 230 has 90 protons and 140 neutrons - the difference is 50.
The atomic number of thorium is 90. so it will always have 90 protons in all its isotope.
Thorium, or Th, has an atomic number of 90. That means that every atom of thorium has 90 protons. The only naturally abundant isotope of thorium is 232Th, and so therefore it has 232 - 90 = 142 neutrons.
Thorium has 90 protons.
If an atom of thorium loses 2 protons, it would turn into an atom of protactinium. Thorium has an atomic number of 90, so losing 2 protons would change it to an atomic number of 88, which is protactinium.
Thorium: 90 protons Uranium: 92 protons
Thorium has 90 protons. So for a neutral atom, there has to be 90 electrons. 230 is the total number of nucleons. ie 90 protons and 140 neutrons.
Thorium has 90 protons and rutherfordium has 104 protons.
The atomic number of thorium is 90. So there are 90 protons and 90 electrons. In Th-230 isotope there are 140 neutrons (230 - 90 = 140) So there are 50 more neutrons than the number of protons.
Thorium has an atomic number of 90, or in other words, 90 protons in its nucleus. The mass number or the identification of the -232 isotope with its 142 neutrons is a red herring - in isotopy the number of neutrons may vary but the atomic number or the count of protons is the same. If the atomic number varied from 90 it would by definition no longer be thorium.