Understanding the Octet Rule and Oxidation Numbers

Why is the periodic table considered an essential tool in chemistry?

• It predicts the color of elements.

• It lists all known chemical compounds.

• It provides information about electron configurations and valence electrons.

• It helps in memorizing chemical reactions.

What does the octet rule state about elements?

• Elements will remain unchanged to maintain stability.

• Elements will always lose electrons to become stable.

• Elements will gain protons to become a noble gas.

• Elements will gain or lose electrons to achieve a noble gas configuration.

How does nature decide whether an element gains or loses electrons?

• By the element's color.

• By the element's melting point.

• By the nearest noble gas configuration.

• By the element's atomic mass.

Why is it easier for oxygen to gain two electrons rather than lose six?

• Because gaining electrons requires less energy.

• Because losing electrons is impossible for oxygen.

• Because oxygen is a noble gas.

• Because oxygen has a high atomic number.

What is the tendency of sodium in terms of electron gain or loss?

• Sodium tends to gain seven electrons.

• Sodium tends to lose one electron.

• Sodium tends to gain one electron.

• Sodium tends to lose seven electrons.

Which element neither gains nor loses electrons due to its noble gas status?

• Oxygen

• Carbon

• Sodium

• Argon

How does carbon's electron gain or loss depend on its bonding partner?

• It can either gain or lose electrons depending on the bonding partner.

• It always loses electrons with non-metals.

• It always gains electrons with metals.

• It never gains or loses electrons.

What is the oxidation number of oxygen when it gains two electrons?

• 2+

• 1-

• 2-

• 1+

What happens to an atom's charge when it loses electrons?

• It becomes more negative.

• It becomes more positive.

• It remains neutral.

• It becomes a noble gas.

What is the possible charge of sodium after losing an electron?

• 2-

• 1-

• 2+

• 1+