Use the formula given below to calculate the force advantage of the crow-bar (lever) in the picture. FA = Leffort / Llifting

Select one:
a. 60
b. 32
c. 15
d. 2

Elements in group viiia (also known as group 18, or the noble gases) have similar properties because they all have a. the same number of electron shells b. full octets c. the same number of valence electrons d. the same number of electrons needed to fill their octet