Trends

Question 1

Atomic radius trend

Answer 1

increases going down - number of shells increases
decreases left to right - nuclear charge increases, attraction forces from the nucleus reduce atomic radius

Question 2

Ionic radius trend

Answer 2

cations smaller than mother atom- less electrons
anions larger than mother atom – more electrons

Question 3

Electronegativity trend

Answer 3

decreases going down- number of shells increases
increases left to right -nuclear charge increases, so the ability to attract electrons does too

Question 4

Ionisation energy trend

Answer 4

decreases going down - easier to remove the last electron
increases left to right - nuclear charge increases and so the last electron is attracted more

Question 5

Electron affinity energy trend

Answer 5

no general trend
1st group exothermic effects of 1st Ea slightly decreases going down - adding an electron is easier

Question 6

noble gases chemical properties

Answer 6

colorless gases
monatomic
very unreactive

Question 7

alkali metals (group 1) chemical properties

Answer 7

very reactive metals
form ionic compounds with non-metals

Question 8

alkali metals physical properties

Answer 8

good conductors of heat and electricity
low densities

Question 9

halogens (group 17) chemical properties

Answer 9

very reactive non-metals
form ionic compounds with metals
covalent compounds with non-metals

Question 10

halogens physical properties

Answer 10

coloured
f2cl2 gases, br2 liquid, i2 at2 solid