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
Related Questions
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
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)
Eka aluminum and Eka silicon are known as
Ga and Ge
Al and Si
Fe and S
N and Mg
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
What was the primary basis for placing elements in the same period in Mendeleev's table?
Similar chemical properties
Increasing atomic number
Increasing atomic weight
Same number of valence electrons
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
Mendeleev arranged elements in increasing order of their:
Atomic number
Atomic weight
Number of neutrons
Number of valence electrons
Which element's properties did Mendeleev accurately predict before its discovery, calling it 'eka-silicon'?
Gallium
Scandium
Germanium
Selenium
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
Mendeleev's periodic table arranged elements into:
Families and series
Groups and periods
Blocks and shells
Orbitals and subshells
