Page 45 - Curriculum Visions Dynamic Book

Gold
Scarce metal, making only 4 parts per hundred million of the Earth’s crust
Has no taste
Has no smell
A soft, yellow metal, chemical symbol Au
Will not react with acids
Does not tarnish in air
Good conductor of electricity
Good conductor of heat
Can be worked into extremely thin sheets or fine wires
Melts at 1063°C
Atomic number 79, atomic weight about 197
 These two pictures show the two sides of a Roman silver denarius, minted in 77 B.C. The side shown on the left shows the helmeted Roma, allegory of the city of Rome, and the side shown below portrays the she-wolf, which refers to
the founding of Rome by Romulus and Remus, mythical twins who were adopted and raised in infancy by a wolf.
SHELL DIAGRAMS
The shell diagrams on these two pages are representations of an atom of each element. The total number of electrons is shown in the relevant orbitals, or shells, around the central nucleus.
Electron shell
Electron
Nucleus containing protons and neutrons (called nucleons)
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