Question

Study the table below and answer the questions that follow.

Element	Atomic radius (nm)	Ionic radius (nm)	Formula of oxide	Melting point of oxide (ºC)
A	0.364	0.421	A2O	-119
B	0.830	0.711	BO2	837
E	0.592	0.485	E2O3	1466
G	0.381	0.446	G2O5	242
J	0.762	0.676	JO	1054

1. Which elements are non-metals? Give a reason. 
2. Explain why the melting point of the oxide of E is higher than that of the oxide of G. 
3. Give two elements that would react vigorously with each other. Explain your answer.

Answer 1

1. Which elements are non-metals? Give a reason.
   • A and G
   • The ionic radius is greater than the atomic radius
2. Explain why the melting point of the oxide of E is higher than that of the oxide of G. 
   • The oxide of E contains strong electrostatic forces since it is ionic while the oxide of G has weak intermolecular forces // van der waals forces since it is molecular.
3. Give two elements that would react vigorously with each other. Explain your answer. 
   • B and A.
   • B is the most reactive metal while A is the most reactive non metal
   • // B has the largest atomic radius so loses electrons most readily while A has the smallest atomic radius so it gains electrons most readily.