Elements Classification Quiz

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