Ionisation energy

Question 1

What is ionisation energy?

Answer 1

amount of energy needed to remove one electron from a gaseous atom

Question 2

What is first ionisation energy?

Answer 2

minimum energy required to remove the first electron from one mole of gaseous atom to form one mole of gaseous singly positive ion

Question 3

What is second ionization energy

Answer 3

Minimun energy required to remove the 2nd electron from one mol of gaseous atom to form one mole of gaseous positive ions a +2 charge

Question 4

Na+ __> U2+

U2+ —> U4+

Answer 4

e-
2e-

(balance to give charge given)

Question 5

What are factors affecting ionization energy

Answer 5

Nucleur charge (no. of protons)

Atomic Size
(due to no. of e- shells)

Shielding effect FYU

Question 6

How does nuclear charge affected ionization energy

Answer 6

When the no. of protons increase = Nuclear charge becomes more positive = Increase efoa btw positive charged nucleus and negatively charged electrons
= More energy needed to remove 1st e- from atom to form a +- charged ion= increase I.E

Question 7

HOW DOES NUCLEUR CHARGE AFFECT TREND IN I.E ACROSS A PERIOD

Answer 7

Across a period =
Chem elements have same no. of e- shells, chem elements add one additional proton

–> only nucleur charge increases = increase f.o.a on all negatively-charged e- –》 held closer and more strongly to the + charged nucleus

Question 8

How does atomic size affect i.e

Answer 8

When more electron shells, distance of valence e- from nucleus INCREASE

attraction of + charged nucleus for negatively charged valence e- decrease

less energy needed to remove 1st electron from atom to form a +-charged ion

decrease i.e

Question 9

TREND IN IONIZATION ENERGY DOWN A GROUP

Answer 9

down a group, one more electron shell for each elementz +- charged nucleus further from negatively charged valence e- = attraction btw +- charged nucleus and - charged valence e- decrease = less energy needed to remove valence electron= decrease i.e down grp

Question 10

data for IONISATION ENERGY

Answer 10

where the graph drops to, that is the e- removed

From graph, sharp increase/ decrease when ____ electron is removed, showing that it is removed from a diff shell, this shell is closer/ further to the nucleus. More/ less energy needed to remove valence e- = thus from ___ group

Question 11

Data for I.e for nucleur charge

Answer 11

From grpah, sharp increase/ decrease when ___ electron is removed, shows that it has a higher/ lower nuclear charge= smaller/ larger atomic no.

Question 12

Consecutive elements

Answer 12

just label