Two isotopes of the same element will have the same but a different mass number, atomic number. atomic number, mass number. atomic mass, mass number. mass number, atomic mass.

The correct answer is atomic number, mass number.

Explanation:

Isotopes are defined as the chemical species which have same number of protons but differ in the number of neutrons.

It can also be said that they are the chemical species of the same element which have same atomic number but have different mass number.

For Example:   are the isotopes of carbon element, which have same atomic number but different mass number.

Hence, the correct answer is atomic number, mass number.

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a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o