Mendeleev predicted the existence of an element he called eka-aluminum. Which of the following properties was NOT a prediction Mendeleev made about eka-aluminum?
The atomic weight of the element
The density of the element
The melting point of the element
The existence of several isotopes of the element
Related Questions
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
One limitation of Mendeleev's periodic table was its inability to perfectly accommodate:
Noble gases
Alkali metals
Halogens
Isotopes
Mendeleev classified elements based on atomic weight, while the modern periodic table uses atomic number. Which anomaly in Mendeleev's table was directly resolved by this change?
Placement of noble gases
Position of tellurium and iodine
Existence of isotopes
Lanthanide contraction
Mendeleev predicted the existence of an element he called eka-aluminum. Which of the following properties was NOT a prediction Mendeleev made about eka-aluminum?
The atomic weight of the element
The density of the element
The melting point of the element
The existence of several isotopes of the element
Mendeleev arranged elements in increasing order of their:
Atomic number
Atomic weight
Number of neutrons
Number of valence electrons
According to the Periodic Law of elements, the variation in properties of elements is related to their
Atomic Numbers
Atomic Masses
Number of Neutrons
Number of Isotopes
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)
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 had similar:
Atomic weights
Atomic numbers
Chemical properties
Number of neutrons
Mendeleev left gaps in his periodic table for undiscovered elements. Which of the following properties was NOT used by him to predict the properties of these missing elements?
Atomic weight
Density
Formulae of oxides and hydrides
Radioactive decay properties
