Theoretical basics of Inorganic chemistry

1.      Write the electron configuration for potassium, lanthanum, copper and bromine.

2.      Name the elements whose electron configuration is:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d³

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d⁹

1s² 2s² 2p⁶ 3s² 3p⁶

3.      Calculate how many times in a second an electron in hydrogen atom orbiting at the level n = 30 goes around the nucleus?

4.      Calculate how much energy does one electron with a principle quantum number of n = 2 have.

5.      Calculate the molecular mass of methane (CH₄). What is the percentage by mass of the elements in this compound?

6.      Show that the mass of the hydrogen atom is 1.6735×10^-24 g and that of the oxygen atom is 2.6561×10^-23 g.

7.      For an ion of ²³Mg write the number of protons, neutrons and electrons.

8.      Calculate the first ionization potential of hydrogen helium atom.

9.      How many electrons are in an atom specified by 1s² 2s² 2p6 3s² 3p⁴?

10.  If naturally occurring carbon consists of 98.892% 12C and 1.108% ¹³C what is the average mass of carbon?

11.  Show that the mass of the hydrogen atom is 1.6735 × 10⁻²⁴ g and that of the oxygen atom is 2.6561 × 10⁻²³ g.