Group Number: For main group elements (s- and p-block elements), the group number corresponds to the number of valence electrons. For example, carbon (C) is in Group 14, so it has 4 valence electrons.

Group Number: For main group elements (s- and p-block elements), the group number corresponds to the number of valence electrons. For example, carbon (C) is in Group 14, so it has 4 valence electrons.

Imaging single atoms of light element by means of transmission electron microscopy (TEM) has two major difficulties compared with heavier elements: the smaller scattering power, which only ...

Cerium has one more electron in its fifth orbital and one more in its fourth than barium. Greg Robson and Pumbaa, CC BY-SA. It’s significant that there are 15 rare earth elements: Chemistry ...