Ionisation Energy

Question 1

what is atomic radius

Answer 1

distance from nucleus to outher most electrons

Question 2

what is shieldign effect

Answer 2

-inner shell electrons create shield for nucleus
-electrons on inner shell repel outer electrons
-weaker attraction w/ outer shell so easier to remove electrons (make atom bigger)

Question 3

what happens to atomic radius across a period

Answer 3

decreases
as p+n added to same shell

Question 4

what is nucleur charge

Answer 4

-measure of how positiv ethe nuleus is
-attarct electrostaticly so smaller radius

Question 5

what is ionisation energy

Answer 5

-energy required to remove 1 electron from each atom
-in 1 mole of gaesous atoms
- to form 1 mole of gaseous 1+ions

Question 6

general forumla for ionisati energy (IE)

Answer 6

X(g)—> X+ (g) + e-
or
X(g) - e- —-> X+(g)

Question 6

what is successive ionisation energy

Answer 6

-removing electrons one by one
-each eletcron will need more energy to be removed

Question 7

in a graph of IE, what does the large gap show

Answer 7

new shell of electrons

Question 8

ionisation trends across a period

Answer 8

-shielding effect stays the same
-nuclear charge incraeses
-stronger attarction in nucleus and valence electrons
-more energy needed to remove eletcron
-therfore, ionisation enegry increasese

Question 9

what does decreasing ionisation energy mean

Answer 9

easier to ionise

Question 9

ionisation trends down a group

Answer 9

-shielding effect increases
-atomic radius incraeses
-nucleaur charge incraeses
-decreasing atttarction in nucleus and valence electrons
-therefore, ionisation enegry decreases