If you have an isotope of the element carbon (c) that has the mass number of 14, what other information would you determine the number of neutrons?
a)atomic mass
b)atomic number
c)number of electrons
d)number of isotopes

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.