La estructura del átomo: las capas electrónicas

The video explains how the reactivity of elements is determined by the number and arrangement of electrons in their outer shells. It describes the structure of electron shells and their capacity to hold electrons. The video also compares the reactivity of different elements, highlighting why some are more reactive than others, such as potassium, which has a single electron in its outer shell, and noble gases like neon and argon, which have full outer shells and are unreactive.

What determines the reactivity of an element?

• The number of protons in the nucleus

• The number of neutrons in the nucleus

• The number and arrangement of electrons

• The atomic mass of the element

How many electrons can the second shell of an atom hold?

• 2 electrons

• 4 electrons

• 6 electrons

• 8 electrons

Which element has a single electron in its outer shell?

• Fluorine

• Argon

• Potassium

• Neon

Why are noble gases like neon and argon unreactive?

• They have a high atomic mass

• They have a full outer shell of electrons

• They have more protons than electrons

• They have no electrons

What happens when an atom achieves a full outer shell?

• It loses all its electrons

• It becomes more reactive

• It becomes less stable

• It becomes stable and unreactive