Electronic Configurations (SL IB Chemistry)

The element chromium has several naturally occurring isotopes whose abundances are shown in Table 1.

Table 1

Calculate the relative atomic mass of chromium to two decimal places.

State the full electron configuration for chromium.

State the meaning of [Ar] and complete the orbital diagram shown below for chromium.

Figure 1

This question is about the chromium(III) ion, .

This question is about line emission spectra of elements.

The visible line emission spectrum of hydrogen is shown below in Figure 1 and the wavelengths of the first four lines are listed in Table 1.

Figure 1

The visible line emission spectrum hydrogen

 Table 1

Draw the shape of a 1s atomic orbital and 2p atomic orbital.    

Describe the relationship between colour, energy, frequency, and wavelength in the visible spectrum.

Electron configurations give you a summary of where you can find an electron around the nucleus of an atom. They can also be determined for an ion after an atom loses or gains electrons.

State the full electron configuration of the rubidium ion, . 

The element rubidium has two naturally occurring isotopes of ⁸⁵Rb and ⁸⁷Rb. The relative atomic mass of rubidium is 85.47. Calculate the percentage abundance of each isotope.

The electrons in an atom are found in orbitals around the nucleus, which have different energy levels sometimes called shells.

Rubidium forms an ionic compound with selenium, Rb₂Se. Using boxes to represent orbitals and arrows to represent electrons, sketch the orbital diagram of the valence shell of selenium on the axis provided.

Figure 1

The diagram below shows electron transitions in a hydrogen atom in two regions of the electromagnetic spectrum.

Using section 5 of the Data booklet, predict which electron transition is most likely to correspond to the emission of red light.

Using sections 1 and 5 of the data booklet, predict which electron transition will correspond to the greatest frequency of light emitted.

The wavelengths of the first four lines for the Balmer series are shown below.

Using section 1 of the Data booklet, determine the ratio of the frequencies H_α to H_γ to 2 decimal places.