Which of the following statements is true about isotopes? question options: the number of protons always equals the number of neutrons in all isotopes. different isotopes for the same element always have the same number of protons. the number of protons never equals the number of neutrons in an isotope. different isotopes for the same element will always have the same numbers of neutrons.

i)The number of protons always equals the number of neutrons in all isotopes.

FALSE

Number of protons and number of neutrons may or may not be same in isotopes as these are the type of same atoms with different mass number and same atomic number

ii) Different isotopes for the same element always have the same number of protons.

TRUE

All isotopes are of same atom so they must have same number of protons in it so these are of same atomic number.

iii) The number of protons never equals the number of neutrons in an isotope.

FALSE

The number of neutrons and protons may be equal in two isotopes of same atom

iv) Different isotopes for the same element will always have the same numbers of neutrons.

FALSE

Number of neutrons must be different in isotopes of same atoms because they are different due to their neutrons

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

its c i just checked it