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To predict the hybridization of the central atom in a molecule or ion, you can use the formula: hybridization = (number of valence electrons on central atom + number of monovalent atoms attached to the central atom - charge)/2. This will give you the approximate hybridization state of the central atom based on the number of regions of electron density around it.
The charge for CrO4 is 2-. This is because the oxygens in the molecule each have a charge of 2-, so the overall charge is balanced by the chromium having a charge of 2+.
The molecular geometry of SnCl4 is tetrahedral. This is because tin (Sn) has 4 bonding pairs of electrons and 0 lone pairs, leading to a symmetrical tetrahedral arrangement of the chlorine atoms around the tin atom.
The central atom in NH2Cl is nitrogen. Nitrogen has 2 nonbonding electron pairs.
angular with 109.5 degree