1.The trend in successive ionization energies as electrons are removed one at a time from an aluminum atom. Why is there a big jump between IE3 and IE4 ?

2. Why does sulphur have a lower first ionization energy than phosphorus?

3.The second ionization energy of lithium is much greater than that of beryllium. Explain.

4.For strontium, which quantity will be greater, the difference between IE1 and IE2 or
the difference between IE2 and IE1?
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the grams   of   barium that   are in   2.3 x 10^23   atoms of barium   is   52.4 g (answer c)

    calculation

mass = moles   of ba   x molar   mass of ba

  molar mass of ba from periodic table=   137.3 g/mol

  use the   avogadro's law   constant   to   calculate the moles of barium

  that   is     1 mole =   6.02   x 10^23 atoms

                    ? moles = 2.3 x 10^23   atoms

by cross   multiplication

=(1 mole   x 2.3x 10^23 atoms)   / 6.02   x10^23 atoms)=   0.382   moles

mass   is therefore = 137.3   g/mol x 0.382 mol = 52.4 ( answer c)

explanation:

un recipient conține 6,4 moli de gaz. gazul hidrogen reprezintă 25% din totalul kilometrilor din container. în cazul în care presiunea totală este de 1.24 atm ceea ce este