Final answer:
The symbol B on the periodic table represents Boron, which has three valence electrons and an atomic number of 5.
Step-by-step explanation:
The symbol B on the periodic table stands for Boron. Boron's valence electron shell configuration is 2s²2p¹, which means it has three valence electrons. Comparatively, for Beryllium (Be), the valence electron shell configuration is 2s² which entails two valence electrons. The atomic number of Boron is 5, which differentiates it from Beryllium with atomic number 4, Barium with atomic number 56, and Berkelium with atomic number 97.