What is the charge of an ion that contains 21 protons and 19 electrons?

What do lines in an elements line spectrum represent?

Seleccione una actividad humana y el impacto generado debe realizar un resumen sobre la actividad seleccionada y dos medidas de prevención para evitar la alteración de los ciclos.

Complete and balance the molecular equation for the reaction of aqueous sodium carbonate, Na 2 CO 3, and aqueous nickel (II) chloride, NiCl 2. Include physical states.

An engineer is trying to create a fast reaction in a fuel mixture. Which should she do? A. Decrease the amount of fuel B. Lower the temperature of the engine C. Add a catalyst to the fuel mixture D. Lower k for the fuel reaction

Which sublevels are full when an atom has a noble gas configuration?

Assuming that air contains 78 percent N2, 21 percent O2 and 1 percent Ar, all by volume. How many molecules of each type of gas are present in 1.0 L of air at STP?

Two children are playing tag. Child A who is doing the chasing can run 100m in 24 seconds Child B is running away from child A and can run 64m in 21 seconds.

What ion does a base increase

What is the definition of Amplitude?

An excess of NiCO3, 12 g, was added to 40cm cube of sulpheric acid, 2.0 mol/dm cube. The unreacted nickel carbonate was filtered out and the filtrate evaporated to optain the crystals.