Older MCQs might not have the typical A, B, C,
D
choices. They
have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such
combinations to the answer.
A
1, 2 and 3 are correct
B
1 and 2 only are correct
C
2 and 3 only are correct
D
1 only is correct
Describe the formation of covalent bonds in simple molecules, including ( CH_3OH ), ( C_2H_4 ), ( O_2 ), ( CO_2 ) and ( N_2 ). Use dot-and-cross diagrams to show the electronic configurations in these and similar molecules
State that: (a) Group VIII noble gases have a full outer electron shell (b) the number of outer shell electrons is equal to the group number in Groups I to VII (c) the number of occupied electron shells is equal to the period number
Draw and interpret the displayed formula of a molecule to show all the atoms and all the bonds
