How many neutrons are in an element with an atomic number of 9 and a mass number of 19? 9

10

18

19

The variability in marine salinity between habitats does not impact the fish living there. select the best answer from the choices provided t f

For each of the following compounds, write the formula then predict whether it would be a strong, weak, or non-electrolyte when placed in di water. for the ionic compounds only, put (s) or (aq) after the forrmula formula strong, weak or non electrolyte? a calcium hydroxide b. silver carbonate c. lead(ii) sulfate d. phosphorus trifluoride e. sodium phosphide f barium sulfate g. strontium acetate h. zinc nitrate

Is a pencil falling to the floor anon contact force, a force, or a contact force