Match the scientists to their contributions to the development of the periodic table. Scientists: Johann Dobhereiner, Henry Moseley, John Newlands, Dmitri Mendeleev

Contributions:

1) proposed a periodic table that accommodated for

the discovery of new elements

2) proposed a triad arrangement based on the elements’

physical and chemical similarities

3) proposed a periodic table based on the repeating properties

of the elements like an octave in music

4) proposed a periodic table based on the increasing order of

the elements’ atomic numbers

1. Dmitri Mendeleev

2. Johann Dobhereiner

3. John Newlands

4. Henry Moseley

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the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.