Element Timeline Antiquity: Au, Ag, Cu, Fe, Pb, Sn, Hg, C, S Before 1735: As, P, Sb, Zn 1735 – 1745 Co, Pt 1745 – 1755: Ni, Bi 1765 – 1775: H, O, N, Cl, Mn 1775 – 1795: Mo, W, Te, U, Sr, Ti, Y 1795 – 1805 : V, Cr, Be, Nb, Ta, Ce, Pd, Os, Rh, Ir 1805 – 1815: Na, K, Ba, Ca, Mg, I, B
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Element TimelineAntiquity: Au, Ag, Cu, Fe, Pb, Sn, Hg, C, S
Before 1735: As, P, Sb, Zn
1735 – 1745 Co, Pt
1745 – 1755: Ni, Bi
1765 – 1775: H, O, N, Cl, Mn
1775 – 1795: Mo, W, Te, U, Sr, Ti, Y
1795 – 1805 : V, Cr, Be, Nb, Ta, Ce, Pd, Os, Rh, Ir
1805 – 1815: Na, K, Ba, Ca, Mg, I, B
Dobereiner’s Triads
7 + 39 = 23 2
For Li, Na and K
deChantcourtois’ Spirals
Newlands’ Octaves
Mendeleev (1869)
Lothar Meyer
Mendeleev’s Gaps
Henry Moseley
Organized according to atomic number rather than atomic mass
S block - Filling available s orbitalsP block - Filling available p orbitalsD block – Filling 3d, 4d, 5d and 6d orbitalsF block – filling 4f and 5f orbitals