(ii) A basic oxide formed when one of the elements in the table is heated in air .................................................................................................................................... 1996 Q 5 a) Using dots (.) and crosses (x) to represent electrons draw diagram to represent ` the bonding in: (i) NH3 (ii) NH4+ (1 mark) b) State why an ammonia molecule (NH3) can combine with H+ to form NH4+ (Atomic numbers: N=7 and H=1) (1 mark) 1996 Q 11 Complete the table below. Species Number of neutrons Electrons H 1996 Q 4 P2 Study the table below and answer the questions that follow: Element Atomic number Relative atomic mass Melting point (oC) Aluminium 13 27.0 Calcium 20 40.0 850 Carbon 12.0 3730 Hydrogen 1.0 -259 Magnesium 24.3 650 12 Neon -249 10 Phosphorous 31.0 44.2 (white) 15 Sodium 23 590 (red)
(ii) A basic oxide formed when one of the elements in the table is heated in air 1996 Q 5 a) Using dots (.) and crosses (x) to represent electrons draw diagram to represent ` the bonding in: (i) NH3 (ii) NH4+ (1 mark) b) State why an ammonia molecule (NH3) can combine with H+ to form NH4+ (Atomic numbers: N=7 and H=1) (1 mark) 1996 Q 11 Complete the table below. Species Number of neutrons Electrons H 1996 Q 4 P2 Study the table below and answer the questions that follow: Element Atomic number Relative atomic mass Melting point (oC) Aluminium Calcium Carbon Hydrogen Magnesium Neon Phosphorous Sodium 13 20 12 10 15 27.0 40.0 12.0 1.0 24.3 31.0 23 850 3730 -259 650 -249 44.2 (white) 590 (red) ....................................................................................................................................
STRUCTURE%20AND%20BONDING.docx