8TH GRADE 3RD 9 WEEKS EXAM 2025 CH. 10,11,12

Which of the following does NOT describe an alkali metal such as lithium?

• hard to cut

• react quickly with oxygen

• silvery appearance

• low density

In general, nonmetals are ____.

• good conductors of electricity

• malleable and ductile

• good conductors of heat

• gases at room temperature

The majority of the human body is made of which type of element?

• metal

• metalloid

• nonmetal

• synthetic

What is the group number for elements that have a stable number of electrons in their outer energy level?

• a. 18

• b. 17

• c. 2

• d. 1

All substances ____.

• are elements

• are compounds

• have a fixed arrangement of atoms

• contain hydrogen

Which of the following compounds is NOT likely to have ionic bonds?

• LiF

• NaCl

• CH4

• MgF2

In general, metals are ____.

• poor conductors of heat

• brittle

• poor conductors of electricity

• good conductors of heat

How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable?

• 2

• 4

• 6

• 8

Which of the following elements is the most common element in the universe?

• hydrogen

• helium

• nitrogen

• oxygen

A halogen is an element that can react with a metal and form ____

• a salt
• a liquid

• metal

• sulfur