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.
I also taught Masters Students at Imperial for 3 years. The atomic number is equal to the number of protons in the nucleus and in a neutral atom will also equal the number of electrons. The atomic number is equal to the number of protons in the nucleus and in a neutral atom will also equal the number of electrons.