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
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
Describe the formation of covalent bonds in simple molecules, including \( H_2 \), \( Cl_2 \), \( H_2O \), \( CH_4 \), \( NH_3 \), \( HCl \), \( CH_3OH \), \( C_2H_4 \), \( O_2 \), \( CO_2 \) and \( N_2 \). Use dot-and-cross diagrams to show the electronic configurations in these and similar molecules
