The following questions are about ceramic silicon nitride size: 1) determine the type of chemical bonding between si and n, given the electronegativity of si and n are 1.8 and 3.0, respectively. 2) if si forms tetrahedron with n, what is the coordination number of si? what is the hybridization type of si, sp, sp or sp ? 3) how can the sina tetrahedra be linked to satisfy the 3: 4 ratio of si to n

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d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.