Which of the following elements is the least abundant in the Earth's crust?

Which element has a mass number of 7 and contains 3 protons?

Which subatomic particle is found in the nucleus of an atom and has a positive charge?

How many neutrons are in a typical atom of sodium (Na) with an atomic number of 11 and an atomic mass of 23?

If the haploid number of sphagnum moss is 19, what is its diploid number?

Which of the following isotopes has the same number of neutrons as phosphorus-31?

How many neutrons are in an atom of carbon-12?

How many neutrons does a typical sodium (Na) atom have, given that its atomic number is 11 and its most common isotope has a mass number of 23?

How many neutrons are in a typical lithium atom with an atomic mass of 7?