PLEASE HELP! (I'm in doubt) Hydroxides and oxides are all insoluble except group 1 and ammonium oxides and hydroxides. Calcium and barium hydroxides are sparingly soluble. Is this statement correct?

What is the compound name for the formula [ru(en)2cl2]2+ and [co(en)cl2br]-

What is the measured amount of a product obtained from a chemical reaction?

The image compares the arrangement of electrons in two different neutral atoms. a figure labeled atom q has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has six black spheres. to the left of this figure is another figure labeled atom p. atom p has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has seven black spheres. which of the following best explains the position of the two atoms in the periodic table? atom p has an estimated zeff of 7 and is therefore to the left of atom q, which has a zeff of 6. atom p has an estimated zeff of 7 and is therefore to the right of atom q, which has a zeff of 6. atom p has an estimated zeff of 5 and is therefore below atom q, which has a zeff of 4. atom p has an estimated zeff of 5 and is therefore above atom q, which has a zeff of 4.