the periodic table

Question 1

how does the character of metallic to non metallic changes?

Answer 1

across the periods

Question 2

what does the number of electrons in the outer shell explain?

Answer 2

it is also the number of group of the element

Question 3

what happens to the melting and boiling point down the group 1?

Answer 3

decreases

Question 4

what happens to the density of elements down group 1

Answer 4

increases

Question 5

what happens to the reactivity of elements down group 1 with water?

Answer 5

increases

Question 6

what happens to the softness of the elements down group 1?

Answer 6

increases

Question 7

list 2 other physical properties of group 1 elements

Answer 7

1. conduct electricity + heat

2. shiny

Question 8

list 2 chemical properties of group 1 elements

Answer 8

1. reacts vigorously with oxygen (always remains under oil)

2. reacts vigorously with water [produces metal sodium hydroxide solution and hydrogen]

Question 9

what is the second name of group 7 elements?

Answer 9

halogens

Question 10

what is the colour of fluorine?

Answer 10

yellow

Question 11

what is the colour of chlorine 1. as a gas?

2. dissolved in a liquid?

Answer 11

1. pale green

2. green-blue

Question 12

what is the colour of bromine 1. as a liquid? 2. dissolved in a liquid?

Answer 12

1. reddish brown

2. orange

Question 13

what is the colour of iodine 1. as a solid? 2. as a gas? 3. dissolved in a liquid?

Answer 13

1. black
2. purple
3. dark brown

Question 14

what happens to melting and boiling point of halogens down the group?

Answer 14

increases

Question 15

what happens to density of halogens down the group?

Answer 15

increases

Question 16

what happens to the colour of halogens down the group?

Answer 16

gets darker

Question 17

name the reaction the halogens undergo?

Answer 17

displacement reaction

Question 18

list 4 general properties of transition elements

Answer 18

1. hard
2. conducts heat and electricity
3. high melting and boiling point
4. highly dense

Question 19

list the 3 properties that differentiate between transition elements and other elements

Answer 19

1. acts as catalysts
2. form coloured compounds
3. have multiple oxidation states

Question 20

list physical properties of noble gases

Answer 20

1. low melting and boiling point
2. colourless gases
3. unreactive

Question 21

name use for helium and a reason for it

Answer 21

used to fill balloons, it is less dense than air and unreactive

Question 22

list 3 uses for argon

Answer 22

1. forms an inert atmosphere for welding
2. fills electric light bulbs because it is unreactive
3. advertising signs