The 3p electron in Aluminium is slightly more distant from the nucleus than the 3s, and partially screened by the 3s 2 electrons as well as the inner
{"Image DocumentName": "If the outer electron looks in towards the nucleus, it doesn t see the nucleus sharply. Between it and the nucleus there are the two layers of electrons in the first and second levels. The 11 protons in the sodium s nucleus have their effect cut down by the 10 inner electrons. The outer electron therefore only feels a net pull of approximately 1+ from the centre.", "Image ImageDescription": "This lessening of the pull of the nucleus by inner electrons is known as screening or shielding.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}