The greatest composition by mass in an atom of 17/8 o is due to the total mass of its

a) electrons
b) neutrons
c) positrons
d) protons

Answer is B) - neutrons.

Both protons and neutrons contribute to the mass of an atom. But ₈¹⁷O atom has atomic number as 8. Hence, number of protons is 8. Atomic mass of the given atom is 17.

Atomic mass = number of protons + number of neutrons

Hence, number of neutrons in the given atom is 17 - 8 = 9.

So, the number of neutrons is greater than the number of protons. Hence the greatest composition of ₈¹⁷O atom is neutrons by mass.

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