Question Bank for Grade 8 Science

The number of protons or electrons contained in an element is the

• atomic number

• atomic mass

• reactivity

• nucleus

the positive charged subatomic particles found in the nucleus

• neutons

• protons

• electrons

• valence electrons

The electrons on the outer shell of an atom that are involved in forming bonds are called

• electrons

• neutrons

• reactivity

• valence electrons

What do you find in the nucleus of an atom?

• protons

• electrons

• neutrons

• a and c

These are shiny, malleable, ductile and good conductors of heat and electricity

• non-metals

• metals

• metalloids

What does malleable mean?

• able to be drawn or pulled into a wire

• able to conduct electricity under certain conditions

• able to be hammered into a thin sheet

• good conductors of heat and electricity

What is ductile?

• good conductor of heat and electricity

• poor conductor of electricity

• able to be hammered into a thin sheet

• able to be drawn/pulled into a wire

4CO₂ has ____ carbon atoms and ____ oxygen atoms

• 4 carbon, 2 oxygen

• 4 carbon, 8 oxygen

• 1 carbon, 1 oxygen

• 1 carbon, 2 oxygen

3Fe₂O₃ has ___ molecules, ___ elements and ___ atoms

• 3,6,9

• 3,2,5

• 1,6,15

• 3,2,15

What is located on the left side of a chemical equation?

• reactant

• product