WorksheetsElements Classification Quiz
Total questions: 15
Worksheet time: 8mins
What was the main purpose of classifying elements?
To increase atomic weights
To facilitate their study
To reduce the number of elements
To create new elements
Who prepared the first periodic table?
Henry Moseley
Dmitri Mendeleev
Niels Bohr
Ernest Rutherford
What did Mendeleev use to represent each element?
Cards
Graphs
Tables
Models
In Mendeleev's periodic table, elements were arranged in vertical columns known as:
Periods
Groups
Rows
Sections
What did Mendeleev predict about new elements?
They would have higher atomic weights
They would be discovered in the future
They would not exist
They would be the same as existing elements
What was a disadvantage of Mendeleev's periodic table?
It included too many elements
It had gaps for undiscovered elements
It disturbed the order of atomic weights
It was too complex
Who discovered that periodic properties are related to atomic number?
Ernest Rutherford
Henry Moseley
Niels Bohr
Dmitri Mendeleev
What did Moseley add to the periodic table?
A section for isotopes
More elements
A zero group for inert gases
A new group for metals
How many main energy levels did Bohr discover?
5
8
6
7
What is the total number of known elements in the modern periodic table?
100
118
92
150
What is an isotope?
An element with different atomic numbers
An element with different atomic weights and the same atomic number
An element that does not exist
An element with the same atomic weight
What did Mendeleev arrange elements by in his table?
Chemical properties
Atomic weight
Physical properties
Atomic number
What did Mendeleev leave in his table for undiscovered elements?
Labels
Warnings
Notes
gaps
Which scientist discovered the nucleus of the atom?
Dmitri Mendeleev
Ernest Rutherford
Niels Bohr
Henry Moseley
What is the main classification method in the modern periodic table?
By atomic weight
By atomic number and way of filling energy sublevel
By size
By color
