Group 17 Elements

Element Y is located in the same group as chlorine in the Periodic Table of Elements.

Which of the following is correct about Y?

• Forms Y+ ion

• Forms basic oxide

• Exists as monoatomic

• Has seven valence electrons

Which elements dissolve in water to produce solution that turns blue litmus paper to red and then

decolourised?

i Chlorine

ii Bromine

iii lodine

iv Astatine

• I and II

• I and III

• II and IV

• III and IV

Which characteristic is correct about elements in Group 17 in the Periodic Table as going down the group?

• The reactivity increases

• The intensity of colour decreases

• The tendency to accept an electron decrease

• The physical state changes from liquid to gas

The boiling point of chlorine is lower than bromine. Which statement best explains this phenomena?

• The atomic size of chlorine is smaller

• The number of electrons in chlorine is smaller

• The covalent bond between chlorine atoms is weaker

• The force of attraction between chlorine molecules is weaker

Which characteristic is similar for all elements in Group 17 of the Periodic Table?

• Form coloured ions

• High melting and boiling points

• Exist as gas at room temperature

• Dissolve in water to form acidic solution