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Chemistry
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Explain the trend in first ionisation energies across a period.

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...

KS
Answered by Kealan S. Chemistry tutor
2214 Views

Why does ionisation energy increase across a period?

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...

AP
Answered by Anjali P. Chemistry tutor
1811 Views

Balance the following equation: Na + H2O -> NaOH + H2

2Na + 2H2O -> 2NaOH + H2

AL
4307 Views

When vaporised, isotopes of an element can be separated in a mass spectrometer. Name the three processes that occur in a mass spectrometer before the vaporised isotopes can be detected. State how each process is achieved. (6 marks)

Once the sample is vaporised, high energy electrons are fired at the sample which knocks off a loosely held electron. (1) This step is known as election impact ionisation. (2) Due to the presence of a cha...

MF
4161 Views

Sodium and chlorine form an ionic compound. Describe what happens when 1 atom of sodium reacts with 1 atom of chlorine.m

When sodium reacts with chlorine, the sodium atom transfers 1 electron to the chlorine atom, in order to achieve a stable electron configuration resembling a noble gas. The sodium (Na) atom becomes a sodi...

PC
Answered by Patrick C. Chemistry tutor
4446 Views

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