periodic table

Question 1

periodic table

Answer 1

• elements with similar properties are in groups

- similar properties occur at regular intervals

Question 2

group 1

Answer 2

• alkali metals
• low density
• react with non metals to form ionic compounds in which the metal ion carries a charge of +1. the compounds are white solids which dissolve in water to form colourless solutions
• react with water releasing hydrogen
• form hydroxides which dissolve in water to give alkaline solutions
• the further you go down the group the more reactive the element

Question 3

transition metals

Answer 3

have higher melting points
higher densities
stronger and harder
much less reactive

than all group 1 metals

• form colured compounds
• catalysts

Question 4

group 7

Answer 4

• halogen
• the further down the group the less reactive the element
• the higher its melting point and boiling point
• a more reactive halogen can replace a less reactive halogen from an aqueous solution of its salt

Question 5

reactivity trends

Answer 5

the higher the energy level of electrons:

• the more easily electrons are lost
• the less easily electrons are gained