In Mendeleev's periodic table, eka-silicon was predicted to have a density of 5.5 g/cm³. Germanium, later discovered to be eka-silicon, has a density of 5.323 g/cm³. This difference in predicted and observed density primarily highlights which limitation of Mendeleev's table?
Inability to predict the existence of noble gases
Placement of isotopes of the same element
Reliance on atomic weight as the primary organizing principle
Lack of understanding of the underlying electronic structure of atoms
Related Questions
Mendeleev arranged the elements in his periodic table based primarily on:
Atomic number
Number of neutrons
Atomic weight
Number of valence electrons
Which of the following pairs of elements would have been placed in the SAME group in Mendeleev's periodic table but DIFFERENT groups in the modern periodic table?
Tellurium (Te) and Iodine (I)
Sodium (Na) and Potassium (K)
Calcium (Ca) and Magnesium (Mg)
Iron (Fe) and Cobalt (Co)
Mendeleev arranged elements in increasing order of their:
Atomic number
Atomic weight
Number of neutrons
Number of valence electrons
If Mendeleev had known about the concept of isotopes, how would his periodic table have been different?
Isotopes of the same element would have been placed in different groups
Isotopes of the same element would have occupied the same position
The table would have been organized based on neutron number
The concept of periodicity would have been discarded
Eka aluminum and Eka silicon are known as
Ga and Ge
Al and Si
Fe and S
N and Mg
In Mendeleev's periodic table, elements in the same group generally have:
The same atomic weight
The same number of neutrons
Similar chemical properties
The same physical state
Which of the following was a significant advantage of Mendeleev's periodic table?
Perfect arrangement of all known elements
Explanation of isotopic variations
Prediction of properties of undiscovered elements
Inclusion of noble gases
Which of the following set of elements cannot be a triad
A) (7, 15, 31)
B) (40, 80, 120)
C) (14, 16, 18)
D) (19, 39, 59)
In Mendeleev's periodic table, eka-silicon was predicted to have a density of 5.5 g/cm³. Germanium, later discovered to be eka-silicon, has a density of 5.323 g/cm³. This difference in predicted and observed density primarily highlights which limitation of Mendeleev's table?
Inability to predict the existence of noble gases
Placement of isotopes of the same element
Reliance on atomic weight as the primary organizing principle
Lack of understanding of the underlying electronic structure of atoms
