Question

4 (a) Complete the table to show the number of electrons and number of neutrons (2) in the barium ion and oxygen atom. number of neutrons number of electrons 137 Baa* 56 81 be 10 8 8 *(b) Explain in terms of electrons, how a barium atom reacts with an oxygen atom [2] to form the barium ion and oxide ion. [Total: 4)

Answer 1

a) Ba2+ = 137 56 NO: of neutron No. of electron = 137-56 = 81 56-2 = 54 16 O 16-8= 8 No. of neutron No. of electron = C (b) Barium loses two electrons to acquire the electronic configuration of its nearest noble gas (saxe, in this case) forming Belt ion whereas atom gains two electrons to aquire the electronic configuration of lone., there by forming 0²-ion. Answer! oxygen у X ttomic no of X = 6 Atomic no of y=8 x will total six electrons ut in the diagram eight have total elections are shown.

no. w has And C arbon to 6 como: its atonic has oxygen equal atomic 8 x = Carbon Y= oxygen CO2. The زند iii) The molecule is Carbon di oxide) atoms in the mode cule held together by Covalent bonds. And such molecules donot conduct electri are city: