Which electron configuration represents an excited state for an atom for calcium

1. 2-8-7-1

2. 2-8-7-2

3. 2-8-7-3

4. 2-8-8-2

What is the purpose of sodium and chloride ions in the exoeruent?

Aniline, a weak base, ionizes as follows: c6h5nh2 h2o → c6h5nh 3 oh - what is the ph of a solution that is 0.30 m in aniline (c6h5nh2) and 0.15 m in anilinium hydrochloride (c6h5nh 3 cl-), a soluble salt

How many kilograms of nickel must be added to 1.75 kg of copper to yield a liquidus temperature of 1300°c?

Compare Dalton's model of the atom with the nuclear model of the atom.

What are the properties of the alkali earth metals

Compare how an increase in wavelength affects sounds and light waves.

The addition of an acid to water increases the [H30*) of the solution and increases the solution pH. True or False True False

31.65 mL volume of 1.07 M Fe (NO3) 3 is mixed with 44.96 mL of 0.79M Fe (NO3) 3 solution. Calculate the molar concentration of the final solution. Save rounding until the end.

At standard pressure, during which physical change does the potential energy decrease?

How are inner and outer planets different?