How many unpaired electrons present in Ca+2
Answers
Step-by-step explanation:
11.How many unpaired electrons are there in a Ca2 ion? b) 1 c) 2 d) 5 12.What is the formula of dibrominetrioxide? a) PO3 b) Br20s c) Br302 d) Br2(02)3 13.A 5.2 cma volume of a substance has a mass of 12.436 g. What is its density? a) 2.39153846 g/cm' b) 2.3915 g/cm2 c) 2.39 g/cm3 d)2.4 g/cm 14. How many electrons are there in a V4* ion? a) 1 b) 19 c)23 d) 27 15. What mass of potassium would contain the same number of atoms as 16.0 g of oxygen? a) 16.0 g b) 39.1g c) cannot be determined 16. In a hydrogen atom, an electron in the 1s orbital is how far from the nucleus? a) 5.26x 10-10 m b) 0.526 nm c) cannot be determined 17. Which atom is more electronegative, Se or CI? a) Se b) CI c) cannot be determined 18. Avogadro's number of carbon dioxide molecules has a mass of a) 6.02 x 1023 g b) 44.0g c)28.0g d) cannot be determined 19. Ifenough water is added to 300 mL of 0.30 M calcium chloride to give a M c0.30M volume of 500 mL, the [CI] is d) 0.18 M a) 0.60 M b)0.36 20. The formal charge on C in COs2" is b) +1 c) -1 d)-2 a) 0