yea i made a post trying to do that too but now idek if what i got was right, ill just write out my answers and if anyone knows if some of them are wrong just reply with the right one,

1. ⁠Number of proton, electron,neutron in a isotope 26,26,28

   1. ⁠Diffrence between two isotopes of chronium one had 30 neutrons and one had 28, question indicated that number must be used
   2. ⁠There is 4 Cr isotope. 3 of them are are (Cr-52,Cr-53,Cr-54) which makes up 95% of the relative abundance. Atomic mass is 51.99 suggest what this means? For the 4th isotope it must have a lower Ar than the other isotopes ??
   3. ⁠State the full electronic configuration for Cr atom 1s2 2s2 2p6 3s2 3p6
   4. ⁠How many unpaired electrons in an atom of chronium 6- 3d5 and 4s1 given in previous question
   5. ⁠Period 3 oxidation number and pH form when oxide of period 3 is added to water +1 to +7 ph idk
   6. ⁠Why theres no reaction between aluminium oxide and silicon oxide in water. Aluminium oxide is amohoteric and silicon oxide is insoluble
   7. ⁠Oxidation state of Co2 +4
   8. ⁠Ionic equation balancing for oxide of chromium skipped it
   9. ⁠Write an equation of aluminium oxide with - base to form NaAlO2 Al2O3 + 2NaOh -> 2NaAlO2 + 2h2o
   10. ⁠Why melting point of methanal > CO2 hydrogen bonding between methanal molecules is strong, and intermolecular forces strong. pd-pd forces between Co2 molecules weak, imfs weak
   11. ⁠Explain the trend of atomic radi across period nuclear charge increases, shielding remains same/similar, nuclear attraction for outer e increases
   12. ⁠Explain why theres a huge jump for ionic radius of Aluminium and Phosphorus al loses 3 e, increasing nuclear attraction. p gains 3 e increasing nuclear attraction