Basic Concepts of Atoms pre-assessment 12

What is the overall charge of a neutral atom?

• Positive

• Negative

• Zero

• It depends on the material

The type of material (conductor or insulator) depends mainly on:

• The number of protons in the nucleus

• The arrangement of neutrons

• The electrons in the outermost shell

• The size of the atom

What do we call the outermost shell of an atom?

• The energy core

• The nucleus

• The valence shell

• The conduction band

When an atom gains an extra electron, it becomes:

• Positively charged

• Negatively charged

• Neutral

• Unstable

Which of the following best describes conductors?

• Materials in which electrons cannot move freely

• Materials that have zero electrical resistance

• Materials in which electrons move easily and freely

• Materials that are always neutral