Which group of elements is known for being the least reactive due to their full valence electron shell?

• Alkali metals

• Noble gases

• Halogens

• Transition elements

Which category of elements is characterized by their inherent radioactivity?

• Actinides

• Alkali metals

• Halogens

• Noble gases

Which of the following elements is commonly used in smoke detectors due to its radioactive properties?

• Chlorine

• Sodium

• Americium

• Helium

Which group of elements is most likely to gain an electron and form a negatively charged ion?

• Alkali metals

• Transition elements

• Noble gases

• Halogens

What is the charge of an ion formed by Halogens when they gain an electron?

• Neutral

• Variable

• Positive

• Negative