The periodic Table (3)

Question 1

Who + when developed the modern periodic table

Answer 1

Dmitri Mendeleev, 1869

Question 2

What are the 5 main properties of Dmitri Mendeleev’s periodic table

Answer 2

• arranged in order of increasing atomic mass
• Left gaps for undiscovered elements
• No noble gases
• No transition metal block
• No actinides or lanthanides

Question 3

What are the 5 main properties of the modern periodic table

Answer 3

• arranged in order of increasing atomic number
• no gaps left
• Noble gases present
• Block of transition metals between group 2+3
• actinides and lanthanides present

Question 4

what are the group 1 elements called?

Answer 4

The alkali metals - the most reactive metals

Question 5

what are the group 7 elements called?

Answer 5

The halogens - the most reactive non-metals

Question 6

what are the group 0 elements called?

Answer 6

The noble gases - unreactive non metals

Question 7

what are the group 2 elements called?

Answer 7

Alkaline earth metals - less reactive than group 1

Question 8

what is the block of elements between group 2+3 called?

Answer 8

the transition metals - form coloured compounds and their unreactive metals

Question 9

what is the most reactive metal

Answer 9

francium

Question 10

what is the most reactive non metal

Answer 10

fluorine

Question 11

what are the two semi metals

Answer 11

Silicon, germanium

Question 12

what are the vertical columns on the periodic table called

Answer 12

groups

Question 13

what are the horizontal rows on the periodic table called

Answer 13

periods

Question 14

floats, moves, bubbles, heat, disappears ,solution, universal indicator

what observations are observed when Lithium (Li) reacts with water

Answer 14

metal floats, moves on surface, bubbles of gas, heat released, Li disappears, colourless solution forms, universal indicator turns purple

Question 15

what is the equation for Lithium reacting with water

Answer 15

2Li + 2H2O –> 2LiOH + H2

Question 16

what observations are observed when Sodium (Na) reacts with water

Answer 16

metal floats, moves on surface, bubbles of gas, heat released, Na melts and forms ball, Na disappears, colourless solution forms, universal indicator turns purple

Question 17

what is the equation for sodium reacting with water

Answer 17

2Na + 2H2O —> 2NAOH + H2

Question 18

what observations are observed when Potassium (K) reacts with water

Answer 18

metal floats, moves on surface, burns with lilac flame, heat released, bubbles of gas, K disappears, colourless solution forms, universal indicator turns purple

Question 19

what is the equation for potassium reacting with water

Answer 19

2K + 2H20 –> 2KOH + H2

Question 20

Name 5 safety precautions we always take when using alkali metals

Answer 20

• safety screen
• hair up and goggles worn
• metal handled with tweezers
• small pieces used
• large volume of water