the periodic table

Question 1

what do periods indicate

Answer 1

the number of energy levels in an atom

Question 2

what do group numbers indicate

Answer 2

the number of valence electrons

Question 3

group 1 properties

Answer 3

-low melting boiling points
-low densities
-good conductors
react with oxygen to form metal oxide
-react with acid to give salt and hydrogen
-react with water to give metal hydroxide and gas

Question 4

group 1 trends

Answer 4

• reactivity increases down the group
• softness increases down the group
• melting and boiling points decrease down the group
• densities increase down the group

Question 5

group 7 properties

Answer 5

• diatomic in nature
• do not conduct electricity
• sparingly soluble in water

Question 6

group 7 at rtp

Answer 6

• chlorine is a yellow-green gas
• bromine is reddish-brown liquid
• iodine is black solid

Question 7

trends group 7

Answer 7

• reactivity decreases down the group
• density increases down the group
• colour of elements become darker the group

Question 8

transition metals physical properties

Answer 8

• harder, tougher, stronger
• high melting and boiling point
• high densities

Question 9

transition metals chemical properties

Answer 9

• less reactive than group 1 metals
• form coloured compounds
• act as catalysts
• have variable oxidation states

Question 10

noble gases

Answer 10

• unreactive, monoatomic gases
• completley filled outer shells
• group 0/group VIII
• used to provide an inert atmosphere (helium baloons, argon lamps)