Ascientist is studying two isotopes of sodium, labeled a and b. in isotope a, each of the atoms has 11 protons, 12 neutrons, and 11 electrons. what could be the atomic structure of isotope b?

Both Isotope has same number of protons and electrons but different number of neutrons.

Isotope A and B has  11 protons and 11 electrons but difference in neutrons. Isotopes is defined as two or more types of atoms that have the same atomic number in the periodic table, and that different number of neutrons in their nuclei. so we can conclude that both have same number of protons and electrons but different number of neutrons.

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trachea, alveoli, lung capillaries, arteries

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.