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

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day