C2. Periodic Table

Question 1

How are elements arranged on the periodic table?

Answer 1

• order of atomic number
• groups have similar properties as they have the same number of electrons in outer shell
• group number equals number of electrons in outer shell

Question 2

Group 1…

Answer 2

• melting and boiling point decreases going down the group
• all react with water to produce hydrogen and an alkali solution containing metal hydroxide
• reactivity increases going down group

Question 3

Group 7…

Answer 3

• halogens form ions with single negative charge i their ionic compounds with metals
• covalent compounds
• more reactive halogen can displace less reactive from a solution of one of its salts
• reactivity decreases going down group

Question 4

Electrostatic attraction depends on?

Answer 4

• distance between outermost electrons and nucleus
• number of occupied inner shells
• size of positive charge n nucleus