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The answer stems from the lanthanide (or lanthanoid) contraction. In more detail, there is a steady decrease in the radii of atoms from Lanthanum through to Lutetium, despite the associated increase in th...

Ionisation energy is the energy required for one mole of gaseous atoms to lose one mole of electrons, hence forming one mole of gaseous ions.The ionisation energies for elements increases across the perio...

To answer this question, we need to know the relative number of atoms of each element present. This can be calculated by dividing the amount of an element present in the sample by the relative masses of t...

When naming alkanes, I like to follow a set of rules:Firstly, draw out the molecule structurally showing all bonds present. Next identify the longest carbon chain. The longest carbon chain determines the ...

The elements in the periodic table are arranged in terms of atomic number. i.e. hydrogen is first as it has 1 proton, then helium with 2, lithium with 3 etc.Elements in the same group have the same number...