12. the periodic table

Question 1

group I : alkali metals physical properties

Answer 1

physical properties -
soft
light
low density
low melting point

Question 2

group I : alkali metals chemical properties

Answer 2

chemical properties -
react vigorously with water
reactivity increases as you go down
form ions with a change of 1+
produce ionic compounds which are all white solids
dissolve in water to give colourless solutions

Question 3

group VII : halogens

Answer 3

all poisonous
density increases as u go down
boiling point increases as u go down
reactivity decreases
with metals form ionic compounds
with non metals have covalent bonds

Question 4

transition elements

Answer 4

high density, melting points, hard and strong, good conductors
much less reactive than group 1
do not show clear trend in reactivity
most form coloured compounds
many act as catalysts
most can form ions with different charges
most can form more than one compound