1.1.2 First ionisation Flashcards Preview

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Flashcards in 1.1.2 First ionisation Deck (6)
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1
Q

What is first ionization energy?

A

It is the energy needed to remove one mole of electron from one mole of a gaseous atom

2
Q

What is the equation for first ionization?

A

X(g) –> X(+)(g) + e(-)

3
Q

What type of reaction is ionization?

A

Endothermic - it requires energy

4
Q

What is the trend in first ionization energy as you go down a group?

A

The first ionization energy decreases as you go down a group. This is because of shielding between the nucleus and the outer electron.

5
Q

What is the trend in first ionization energy as you go across a period?

A

It will increase as you go across a period. This is because there is a higher nuclear charge, but with similar shielding.

6
Q

What is the evidence for energy sub-levels?

A

There is a slight drop in first ionization energy as you enter a new sub-shell. This is because new sub-shells have slightly higher energy, meaning less is needed to remove an electron.