Periodicity Flashcards
What is the covalent radius
Is half the distance between the nuclei of the covalently bonded atoms
What is the first ionisation energy
The energy required to remove one mole of electrons from one mole of gaseous atoms
What type of process is ionisation energy
Endothermic so delta H will be positive
As you go across the period the ionisation energy ____
Increases
As you go down a group the ionisation energy ____
Decreases
Why does the 1st ionisation energy decrease as you do down a group
- increasing atomic size
- shielding effect of inner electrons
Why does the 1st ionisation energy increase as you do across a group
- decreasing atomic size
- increasing nuclear charge
What happens to atomic size as you go across a period
Decreases due to increasing positive pull of the nucleus on the same number of electron shells
What happens to the electronegativity as you go across a period
Increases
Why does electronegativity increase as you go across a period
- decreasing atomic size
- increasing nuclear charge
What happens to atomic size and why as you go down a group
Increases due to increasing number of electron shells
What happens to electronegativity as you go down a group
Decreases
Why does electronegativity decrease as you go down a group
- increasing atomic size
- shielding affect of inner electrons
What is electronegativity
The ability of an atom to attract the electrons in the bond towards itself
