Hydrogen1·01 Helium4·2
Lithium7·0 Beryllium9·1 Boron11·0 Carbon12·0 Nitrogen14·0 Oxygen16·0 Fluorine19·0 ?
Sodium23·0 Magnesium24·3 Aluminium27·0 Silicon28·3 Phosphorus31·0 Sulphur32·1 Chlorine35·5 Argon39·9
Potassium39·1 Calcium40·1 Scandium44·1 Titanium48·1 Arsenic75·1 Selenium79·0 Bromine80·0 ?
Rubidium85·5 Strontium87·5 Yttrium89·0 Zirconium90·0 Antimony120·3 Tellurium126·3 Iodine126·9 ?
Caesium132·9 Barium137·0 Lanthanum142·3 Cerium140·3 Erbium166·0 ?167·0 ?169·0 ?
?170·0 ?172·0 Ytterbium173·0 ?177·0 Bismuth208·1 ?214·0 ?219·0 ?
?221·0 ?225·0 ?230·0 Thorium232·4
Hydrogen1·01 Helium4·2
Lithium7·0 Beryllium9·1 Boron11·0 Carbon12·0 Nitrogen14·0 Oxygen16·0 Fluorine19·0 ?
Sodium23·0 Magnesium24·3 Aluminium27·0 Silicon28·3 Phosphorus31·0 Sulphur32·1 Chlorine35·5 Argon39·9
{Iron56·0
Copper63·4 Zinc65·3 Gallium69·9 Germanium72·3 Vanadium51·4 Chromium52·3 Manganese55·0 {Cobalt58·7
{Nickel58·6
{Ruthenium101·6
Silver107·9 Cadmium112·1 Indium113·7 Tin119·1 Niobium94·0 Molybdenum95·7 ?100·0 {Rhodium103·0
{Palladium106·3
?156·0 ?158·0 ?159·0 Terbium162·0 Neodymium140·8 Praseodymium143·6 Samarium150·0 ?152,153,154
{Osmium191·3
Gold197·2 Mercury200·2 Thallium204·2 Lead206·9 Tantalum182·5 Tungsten184·0 ?190·0 {Iridium193·0
{Platinum194·3
Uranium240·0 ?244·0
Lithium7·0 Beryllium9·1 Boron11·0 Carbon12·0
Sodium23·0 Magnesium24·3 Aluminium27·0 Silicon28·3
Potassium39·1 Calcium40·1 Scandium44·1 Titanium48·1
Rubidium85·5 Strontium87·5 Yttrium89·0 Zirconium90·0
Caesium132·9 Barium137·0 Lanthanum142·3 Cerium140·3
?170·0 ?172·0 Ytterbium173·0 ?177·0
?221·0 ?225·0 ?230·0 Thorium232·4
Hydrogen1·01 Helium4·2
Nitrogen14·0 Oxygen16·0 Fluorine19·0 ?
Phosphorus31·0 Sulphur32·1 Chlorine35·5 Argon39·9
Arsenic75·1 Selenium79·0 Bromine80·0 ?
Antimony120·3 Tellurium126·3 Iodine126·9 ?
Erbium166·0 ?167·0 ?169·0 ?
Bismuth208·1 ?214·0 ?219·0 ?
Lithium7·0 Beryllium9·1 Boron11·0 Carbon12·0
Sodium23·0 Magnesium24·3 Aluminium27·0 Silicon28·3
Copper63·4 Zinc65·3 Gallium69·9 Germanium72·3
Silver107·9 Cadmium112·1 Indium113·7 Tin119·1
?156·0 ?158·0 ?159·0 Terbium162·0
Gold197·2 Mercury200·2 Thallium204·2 Lead206·9
Hydrogen1·01 Helium4·2
Nitrogen14·0 Oxygen16·0 Fluorine19·0 ?
Phosphorus31·0 Sulphur32·1 Chlorine35·5 Argon39·9
{Iron56·0
Vanadium51·4 Chromium52·3 Manganese55·0 {Cobalt58·7
{Nickel58·6
{Ruthenium101·6
Niobium94·0 Molybdenum95·7 ?100·0 {Rhodium103·0
{Palladium106·3
Neodymium140·8 Praseodymium143·6 Samarium150·0 ?152,153,154
{Osmium191·3
Tantalum182·5 Tungsten184·0 ?190·0 {Iridium193·0
{Platinum194·3
Uranium240·0 ?244·0

The elements in the first column all agree in that they are white soft substances, with metallic lustre, but tarnish rapidly in air, owing to the action of water-vapour; they are all violently attacked by water, and they are without exception monads, that is, they replace hydrogen in its compounds atom for atom. The elements in column two are also all white metals, attacked by water with more or less ease; but in their case one atom replaces two atoms of hydrogen, whence they are called dyads, or bivalent elements (worth two). And so on with the other columns. All elements in vertical columns exhibit chemical similarity, and, indeed, are often strikingly like in properties.

The subdivision, produced by folding the loose page, is intended to show that the elements represented on it have a double set of resemblances. But there are various anomalous and inexplicable phenomena still attached to this arrangement of elements. For example, copper, although it replaces one atom of hydrogen in some of its compounds, and is thus a monad, forms more numerous and more stable compounds in acting as a dyad and replacing two atoms of hydrogen. Gold, which belongs to the same column, is at once univalent and tervalent; mercury, both univalent and bivalent; thallium, univalent and tervalent; tin and lead, bivalent and quadrivalent, and so on. It is as if some elements had a tendency to enter a column not their own.

Again, on comparing the atomic weights of the elements, it is seen that the differences are far from being regular. As a rule, the difference in the vertical columns between any single element and the one following it is approximately 16, or some multiple of 16. Thus we have lithium, sodium, and potassium; beryllium, magnesium, and calcium; boron, aluminium, and scandium; carbon and silicon; oxygen and sulphur; fluorine and chlorine—all with a difference of 16 approximately. But here we come to a break: silicon and titanium, phosphorus and vanadium, sulphur and chromium, chlorine and manganese, each show a difference of about 20.