How how do i find out many protons are found in the nucleus of a boron-11 (11B) atom?

2.87 What is the heaviest element to have an atomic weight that is roughly twice its atomic number? What does this suggest must he true about the nuclei of atoms with higher atomic numbers?

2-31 Tin-118 is one of the isotopes of tin. Name the isotopes of tin that contain two, three, and six more neutrons than tin-118.

Though the common isotope of aluminum has a mass number of 27, isotopes of aluminum have been isolated (or prepared in nuclear reactors) with mass numbers of 24, 25, 26, 28, 29, and 30. How many neutrons are present in each of these isotopes? Why are they all considered aluminum atoms, even though they differ greatly in mass? Write the atomic symbol for each isotope.

2-102 An element consists of 90.51% of an isotope with a mass of 19.992 amu, 0.27% of an isotope with a mass of 20.994 amu, and 9.22% of an isotope with a mass of 21.990 amu. Calculate the average atomic mass and identify the element.

How many protons, neutrons, and electrons are in the following atoms: (a) ²⁸Si; (b) ⁶⁰Ni; (c) ⁸⁵Rb; (d) ¹²⁸Xe; (e) ¹⁹⁵Pt; (f) ²³⁸U?

Predict which one is the most stable nucleus amongst _8 O^16, _8 O^17 and _8 O^18. ( In this case you have to differentiate w.r to A. See A is the variable in the isotope family. Then find the value of A and see which value is this A close to)

How many protons, neutrons,and electrons are there in an atom of (a) 10 5B, (b) 36Ar, (c) 8538Sr, and (d) carbon-11?

You are exploring the universe in your spaceship, and you land on a planet that is very similar to Earth. You encounter humanoid life forms that are comprised of molecules containing many carbon atoms (just like humans on Earth). And just like here on Earth, there are three isotopes of carbon: 12C, 13C, and 14C. However, on this new planet that you have discovered, the average isotopic mass of carbon is 13.101 amu. What can you conclude about this planet that you have discovered? Mark any/all that apply. Of the three isotopes of carbon, 14C has the greatest percent abundance. Half a mole of methane (CH4) on this new planet has a greater mass than half a mole of methane (CH4) on Earth. Of the three isotopes of carbon, 12C has the greatest percent abundance. Half a mole of methane (CH4) on this new planet has a lower mass than half a mole of methane (CH4) on Earth. Of the three isotopes of carbon, 13C has the greatest percent abundance.

An isotope with atomic number 64 and mass number 158 is found to have a mass ratio relative to that of carbon-12 of 13.16034. What is the isotope, what is its atomic mass in u, and what is its mass relative to oxygen-16?