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Periodic Classification of Elements mcq NEET for Students
Mendeleev arranged elements in the Periodic Table based on
a. Decreasing atomic masses
b. Increasing atomic masses
c. Decreasing atomic numbers
d. Increasing atomic numbers
Option b – Increasing atomic masses
In the sequence Li, Be, B, C, N, O, F, Na – which elements exhibit similar characteristics as per Newlands’ law?
a. Li, F
b. Be, Na
c. Li, Na
d. C, N
Option c – Li, Na
Newlands’ law of octaves was found to be invalid when applied to
a. Elements with lower atomic weights
b. Elements with higher atomic weights
c. Gaseous elements
d. None of the above
Option b – Elements with higher atomic weights
Manganese is not chemically similar to
a. Chlorine
b. Phosphorus
c. Sulfur
d. Chromium
Option b – Phosphorus
The idea of Periodic law, forming the basis of modern element classification, was introduced by
a. Mendeleev
b. Lothar Meyer
c. Both a and b
d. None of the above
Option c – Both a and b
Who emphasized atomic properties as a foundation for classifying elements?
a. Mendeleev
b. Mosley
c. De Chancourtois
d. Pettenkofer
Option a – Mendeleev
The classification system based on atomic Mass was developed by
a. Mendeleev
b. Lothar Meyer
c. Mosley
d. Both a and b
Option d – Both a and b
While organizing the elements, Mendeleev focused primarily on their
a. Chemical behavior
b. Physical attributes
c. Atomic dimensions
d. Electron orbitals
Option a – Chemical behavior
Lothar Meyer’s classification emphasized more on
a. Chemical characteristics
b. Atomic numbers
c. Physical properties
d. Atomic nuclei
Option c – Physical properties
According to Mendeleev’s Periodic law, element properties repeat periodically with respect to their
a. Atomic numbers
b. Atomic masses
c. Atomic sizes
d. Atomic volumes
Option b – Atomic masses
The earliest attempt to categorize elements was made by
a. Dobereiner
b. Mendeleev
c. Mosley
d. John Newlands
Option a – Dobereiner
A triad refers to
a. A group of three elements
b. A group of four elements
c. A group of five elements
d. A group of six elements
Option a – A group of three elements
Dobereiner grouped elements in the form of
a. Groups
b. Periods
c. Triads
d. All of the above
Option c – Triads
In Dobereiner’s triads, the atomic weight of the middle element is
a. The total of the first and third elements’ weights
b. The product of the first and third elements’ weights
c. The ratio of the first to the third element’s weight
d. The average of the first and third elements’ weights
Option d – The average of the first and third elements’ weights
Which of the following is a true triad?
a. Na, Ne, K
b. Cl, Br, I
c. Li, Fe, Ni
d. C, N, O
Option b – Cl, Br, I
The elements Li, Na, and K form a group known as a
a. Metals
c. Inactive Metals
d. Triad
Option d – Triad
Identify the group that does not qualify as a triad
a. S, Se, Te
b. Fe, Co, Ni
c. Li, Na, K
d. Na, Mg, Al
Option d – Na, Mg, Al
The law of octaves was introduced by
a. Mosley
b. Mendeleev
c. Newlands
d. Pettenkofer
Option c – Newlands
As per Newlands’ law of octaves, when elements are ordered by increasing atomic Mass
a. Every sixth element shows similar traits
b. Every eighth element shows similar traits
c. Every eighteenth element shows similar traits
d. Every fourth element shows similar traits
Option b – Every eighth element shows similar traits
Elements from atomic number 89 to 102 are classified as
a. Lanthanides
b. Actinides
c. Noble gases
d. Representative elements
Option b – Actinides
Based on electronic structure, elements are divided into how many categories?
a. Two
b. Three
c. Four
d. Five
Option c – Four
All noble gases are placed in which group?
a. Zero group
b. First group
c. Second group
d. Third group
Option a – Zero group
Each horizontal row (period) in the Periodic Table ends with a
a. Halogen
b. Chalcogen
c. Noble gas
d. None of the above
Option c – Noble gas
How many elements are there in the 4th and 5th periods?
a. 2
b. 8
c. 18
d. 28
Option c – 18
The sixth period of the Periodic Table includes
a. 18 elements
b. 8 elements
c. 32 elements
d. Incomplete
Option c – 32 elements
The seventh period of the Periodic Table is
a. A short period
b. A long period
c. Still incomplete
d. None of the above
Option c – Still incomplete
Lanthanides include elements with atomic numbers ranging from
a. 51 to 70
b. 89 to 102
c. 11 to 18
d. 37 to 54
Option a – 51 to 70
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