This question is about atomic structure and isotopes.

Name the parts of the atom labeled A and B.
Choose answers from: electron, neutron, nucleus, proton.
Which subatomic particle has a relative charge of +1+1+1?
Choose from: electron, neutron, proton.
Which group of the periodic table contains element X?
Using the diagram, determine the atomic number and the mass number of element X.
Two of the isotopes of lithium are represented as 36Li^{6}_{3}\text{Li}36Li and 37Li^{7}_{3}\text{Li}37Li. The relative atomic mass (ArA_rAr) of lithium is 6.946.946.94. Which statement is true about the abundance of each isotope in a sample of lithium?