Answer: 2 protons.
Explanation:
1) The number of protons is indicated by the atomic number (Z)
2) Atomic number of uranium-238 and any uranium isotope is the same: 92. You find it in a periodic table.
So, the number of protons of uranium-238 is 92.
3) Atomic number of thorium-234 (and any thorium isotope) is 90, that is why it is told that it has 90 protons.
4) Therefore, the difference on the number of protons in each nucleus of uranium-238 and thorium-234 is 92 - 90 = 2.
<span>The movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat. Thats why his statement is incorrect.</span>
Answer:
D if I'm incorrect then sorry.
Explanation:
They are called magnetic poles.
Such questions are not at all difficult... You must have patience as well good at trigonometry.. rest it depends whether you are cleared with concepts or not. Practice such questions daily you'll be master then. Hope you are able to see my solution :)