Atomic Structure And Isotopes Qs

Question 1

Explain what is meant by the term relative atomic mass of an element

Answer 1

Mean mass of an atom
Compared with mass of carbon-12 which is 12

Question 2

How do you determine the other isotope in a sample when given percentages?

Answer 2

Multiply the overall relative atomic mass by 100
Multiply the given percentages by their atomic number
Add those values up and divide it by 100 — the given percentages

Question 3

State two differences between isotopes of the same element

Answer 3

Different number of neutrons
Different atomic masses

Question 4

How do you calculate the relative atomic mass of an element in a given sample?

Answer 4

Multiply the abundances by the atomic numbers and add them up
Divide that value by 100

Question 5

Why do different isotopes of the same element have the same chemical properties?

Answer 5

Same number of electrons in outer shell