Electron Arrangement and Stability Quiz

Why do atoms strive to have a full outer shell of electrons?

• To increase their atomic number

• To become more reactive

• To achieve stability

• To decrease their mass

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

• 2

• 4

• 6

• 8

What is the electron arrangement of sodium?

• 2, 8, 1

• 2, 8, 8

• 2, 7, 2

• 2, 8, 2

Why are noble gases generally unreactive?

• They have no electrons

• They have full outer shells

• They have a high atomic number

• They have incomplete outer shells

What is the electron arrangement of argon?

• 2, 8, 8

• 2, 8, 7

• 2, 7, 8

• 2, 8, 6

How does calcium achieve stability?

• By gaining two electrons

• By gaining one electron

• By losing one electron

• By losing two electrons

What charge does a calcium ion have after losing two electrons?

• 2-

• 1-

• 2+

• 1+

What is the electron arrangement of fluorine before it gains an electron?

• 2, 9

• 2, 6

• 2, 7

• 2, 8

What happens to fluorine when it gains an electron?

• It becomes a neutral atom

• It becomes a fluoride ion with a 2- charge

• It becomes a fluoride ion with a 1- charge

• It becomes a fluoride ion with a 1+ charge

What is the electron arrangement of a fluoride ion?

• 2, 8

• 2, 9

• 2, 7

• 2, 6