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Q. A sample of strontium has a relative atomic mass of 87.7 and consists of three isotopes, ⁸⁶Sr, ⁸⁷Sr and ⁸⁸Sr. In this sample, the ratio of abundances o...

Methanol under normal conditions.Refer to whiteboard.Irreversible, easier conditions to meet, faster.

Iodine is further down group 7 than chlorine. Their group number only describes the number of electrons they have in their outer shell. As iodine has a higher atomic number than chlorine, it also has more...

There is a general increase in the ionisation energy as we move across a period. This is because the the number of shielding electrons is constant and the atomic number increases, which means the effect...

As you go across the period, the nuclear charge (or number of protons increase) but the shielding (or the number of shells) stays the same as all of the elements are on the same period. This causes the nu...