Classification of Elements

Who is known as the father of periodic table, who arranged the elements in order?

• Dmitri Mendeleev

• Robert Hooke

• Jons Jacob Berzelius

• John Dalton

Which property of metals is CORRECT?

• Dull

• Brittle

• Semiconductors

• Malleable

Cobalt is an example of

• Metalloid

• Metal

• Nonmetal

• None of the above

Which of the following is the CORRECT about an element?

• It is a pure substance that contains many types of atoms.

• Its atom can be separated or broken down into other substances.

• It contains only one type of atom and cannot be separated or broken down into other substances.

• It is a mixture that contains many substances.

What does it mean when an element is dull?

• in liquid state

• not glowing or lacking brightness

• conducts heat

• hard but easy to break

In what state nonmetals can be found?

• solid only

• liquid only

• gas only

• solid, liquid, and gas

How many elements are in the periodic table?

• 110 elements

• 118 elements

• 128 elements

• 188 elements

What does groups in periodic table mean?

• column of elements

• row of elements

• elements in zigzag line

• the first element in the periodic table

What is the appearance of of phosphorus at room temperature?

• solid

• liquid

• gas

• Sometimes gas

Metalloids have high melting and boiling points.

• True

• False