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NEET Questions / Chemistry / Classification of Elements and Periodicity in Properties
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
Mendeleev's periodic table arranged elements into:
Families and series
Groups and periods
Blocks and shells
Orbitals and subshells
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
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
Which element's properties did Mendeleev accurately predict before its discovery, calling it 'eka-silicon'?
Gallium
Scandium
Germanium
Selenium
Which of the following properties is NOT a characteristic of metalloids?
Intermediate electrical conductivity
Brittle nature
Good conductors of electricity at all temperatures
Exhibit both metallic and non-metallic properties
Which block of the periodic table contains the most reactive metals?
s-block
p-block
d-block
f-block
Elements in the same group of the periodic table have similar chemical properties. This is primarily due to:
The same number of protons
The same number of neutrons
The same number of valence electrons
Similar atomic masses
Which of the following is a characteristic of noble gases?
High electronegativity
Very low reactivity
Tend to form positive ions
Readily form chemical bonds
