Membranes â¢ Provide barrier function â Extracellular â Organelles â¢ Barrier can be overcome by âtransport proteinsâ â To mediate transmembrane movements of ions, Na + , K + â Nutrients, glucose, amino acids etc. â Water (aquaporins).
Boron is a chemical element with symbol B and atomic number 5. Produced entirely by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, it is a low-abundance element in the Solar system and in the Earth's crust.
I disagree with your electronic configuration for boron. It only has 5 electrons, not 6 as you first indicated. The electron configuration for boron is 1s2, 2s2, 2p1. The valence electrons are those in the second shell, 2s2, 2p1. Since the boron ion has a +3 charge, it loses all three electrons in the second shell to leave the core electrons as 1s2, which makes the Boron ion isoelectronic with the noble gas He. Source(s): General chemical knowledge.