What do an orgasm, a multiplication problem and a photo of a dead body have in common? Each induces a slight, irrepressible expansion of the pupils in our eyes, giving careful observers a subtle but meaningful signal that thoughts and feelings are afoot. For more than a century, scientists have known that our pupils respond to more than changes in light.
Review. 1  Atoms have their electrons arranged in layers called shells. 2  In order to maintain electrical balance the number of electrons is equal to the number of protons in most elements.
A neutral nitrogen atom has 7 protons, 7 neutrons, and 7  electrons. If it is electrically charged, the number of electrons  will be different. If it is an isotope of nitrog â¦ en other than the  most common (N-14), the number of neutrons will be different.  Protons = Atomic Number   Neutrons = Atomic Mass-Protons   Electrons = Protons   Atomic number is the amount of protons in element.f it is an isotope of nitrog â¦ en other than the  most common (N-14), the number of neutrons will be different.   Protons = Atomic Number   Neutrons = Atomic Mass-Protons   Electrons = Protons   Atomic number is the amount of protons in element.