Electronic Structure

Why do most atoms react with other atoms?

• To increase their atomic number

• To fill their outer shell with electrons

• To become noble gases

• To reduce their mass

What is the maximum number of electrons the second shell can hold?

• 32

• 18

• 8

• 2

How many electrons does sodium have in its outermost shell?

• 1

• 8

• 2

• 7

Which group of elements have a completely full outer shell and are mostly unreactive?

• Transition metals

• Noble gases

• Alkaline earth metals

• Alkali metals

What is the electron structure of argon?

• 2, 8, 18

• 2, 8, 8, 1

• 2, 8, 7

• 2, 8, 8

What happens to the charge of a calcium atom when it loses two electrons?

• It becomes a 2- ion

• It remains neutral

• It becomes a 2+ ion

• It does not change

How can fluorine achieve a stable electron configuration?

• By gaining one electron

• By losing two electrons

• By sharing electrons

• By losing one electron

What is the correct way to represent the electron structure of calcium after it has lost two electrons?

• 2, 8, 8, 2

• 2, 8

• 2, 8, 10

• 2, 8, 8

What is the atomic number of sodium?

• 12

• 13

• 11

• 10

What is the electron structure notation for an atom with 2 electrons in the first shell, 8 in the second, and 7 in the third?

• 2, 7, 8

• 2, 7, 7

• 2, 8, 7

• 2, 8, 8