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Mendeleev drew a best-fit line along each group to estimate the values in the gaps. Here's what I was able to construct (n = row number; for example in Group 18 He = 1, Xe = 2, ... ) Some materia...
#2: Post edited
by
James McLellan
·
2025-12-28T21:11:36Z (9 months ago)
- Mendeleev drew a best-fit line along each group to estimate the values in the gaps.
- Here's what I was able to construct (n = row number; for example in Group 18 He = 1, Xe = 2, ... )
- Group #, Melting Point (C)
* 1 : y = (-80/(n-3) - 259* 2 : y = (-80/(n-4)) +1287- * 3 : y =70 (n-1) + 1500
- * 4 : y = 200 ( n - 1 ) + 1670
- * 5 : y = 530 ( n -1 ) + 1900
- * 6 : y = 750 (n - 1) +1900
- * 7 : y = 1000 ( n - 1) + 1100
- * 8 : y = 900 ( n - 1) + 1500
- * 9 : y = 450 ( n -1) + 1495
- * 10: y = 150 (n-1) +1450
- * 11: y = 1083
- * 12: y = (-100) (n-1)+400
- * 13: y = 120 (n-4) + 156
- * 14: y = -800 ( n - 1) +3500
- * 15: y = 120 ( n - 1) - 210
- * 16: y = 120 ( n - 1) - 218
- * 17: y = 120 ( n - 1 ) -219
- * 18: y = 50 ( n - 1) -272
- Mendeleev drew a best-fit line along each group to estimate the values in the gaps.
- Here's what I was able to construct (n = row number; for example in Group 18 He = 1, Xe = 2, ... )
- Some materials (famously, Mercury, Gallium) are way off predictions because of relativistic effects.
- Group #, Melting Point (C)
- * 1 : y = (-80/(n-3) - 259 ( only valid for n >=3)
- * 2 : y = (-80/(n-4)) +1287 ( only valid for n >= 4)
- * 3 : y =70 (n-1) + 1500
- * 4 : y = 200 ( n - 1 ) + 1670
- * 5 : y = 530 ( n -1 ) + 1900
- * 6 : y = 750 (n - 1) +1900
- * 7 : y = 1000 ( n - 1) + 1100
- * 8 : y = 900 ( n - 1) + 1500
- * 9 : y = 450 ( n -1) + 1495
- * 10: y = 150 (n-1) +1450
- * 11: y = 1083
- * 12: y = (-100) (n-1)+400
- * 13: y = 120 (n-4) + 156
- * 14: y = -800 ( n - 1) +3500
- * 15: y = 120 ( n - 1) - 210
- * 16: y = 120 ( n - 1) - 218
- * 17: y = 120 ( n - 1 ) -219
- * 18: y = 50 ( n - 1) -272
#1: Initial revision
by
James McLellan
·
2025-12-28T21:10:29Z (9 months ago)
Mendeleev drew a best-fit line along each group to estimate the values in the gaps. Here's what I was able to construct (n = row number; for example in Group 18 He = 1, Xe = 2, ... ) Group #, Melting Point (C) * 1 : y = (-80/(n-3) - 259 * 2 : y = (-80/(n-4)) +1287 * 3 : y =70 (n-1) + 1500 * 4 : y = 200 ( n - 1 ) + 1670 * 5 : y = 530 ( n -1 ) + 1900 * 6 : y = 750 (n - 1) +1900 * 7 : y = 1000 ( n - 1) + 1100 * 8 : y = 900 ( n - 1) + 1500 * 9 : y = 450 ( n -1) + 1495 * 10: y = 150 (n-1) +1450 * 11: y = 1083 * 12: y = (-100) (n-1)+400 * 13: y = 120 (n-4) + 156 * 14: y = -800 ( n - 1) +3500 * 15: y = 120 ( n - 1) - 210 * 16: y = 120 ( n - 1) - 218 * 17: y = 120 ( n - 1 ) -219 * 18: y = 50 ( n - 1) -272