Periodic Table

Question 1

What are the physical properties of Group 1 metals

Answer 1

soft, low melting points, and low density

Question 2

What are the chemical properties of Group 1 metals

Answer 2

• Reacts with water to form metal hydroxide and hydrogen gas
• Reacts with non-metal to form an ionic compound.
• Powerful reducing agents

Question 3

What is the trend going down group 1

Answer 3

• Reactivity increases as atomic size increases, increasing the distance between valence electron and
  the attractive force of nucleus. Hence valence electron is easily lost to form a cation.
• Melting points decreases as ionic size increases, increasing the distance between delocalised electrons and the attractive force of nucleus, decreasing the strength of the electrostatic forces of attraction, less energy needed to overcome. Hence melting point decreases down the group.

Question 4

What are the physical properties of group 17 elements

Answer 4

low boiling points, coloured and exists as diatomic molecules.

Question 5

What is the colour of F2

Answer 5

pale yellow

Question 6

what is the colour of Cl2

Answer 6

Greenish yellow

Question 7

What is the colour of Br2

Answer 7

Reddish-brown

Question 8

What is the colour of I2

Answer 8

Black(S), Purple(G), Brown(Aq)

Question 9

What is the colour of At2

Answer 9

black

Question 10

what are the chemical properties of group 17 elements

Answer 10

• Reacts with non-metal to form a covalent compound.
• Reacts with metal to form an ionic compound.
• Powerful oxidizing agents
• Displaces a less reactive halide ion from its aqueous solution.

Question 11

What is the trend going down group 17

Answer 11

• Reactivity decreases as atomic size increases, increasing the distance between valence shell and the attractive force of nucleus. Hence atom will be harder to gain one valence electron to form an
  anion.
• Melting points increases as size of molecule increases, strength of intermolecular forces of attraction increases, more energy needed to overcome. Hence melting point increases down the group.
• Colour darkens.

Question 12

What is the properties of group 18 elements

Answer 12

Monatomic, Low boiling points, Colourless gases at r.t.p., Insoluble in water, Inert/unreactive due to full valence shell/stable electronic configuration.

Question 13

what are the properties of transition metals

Answer 13

• Can have variable oxidation states
• Often forms coloured compounds
• Some can act as catalysts to speed up certain reactions
• High melting points
• High density

Question 14

What happens when group 1 metals react with water?

Answer 14

• Vigorous effervescence (H2 gas is flammable and may cause explosions.)
• Li/Na/K floats/darts on surface of water.
• Exothermic reaction, releases a lot of heat
• Product is a strong alkali (turns UI violet).