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Elements quick check

A quick check of 3 questions. After you submit, each question shows the right answer and why.

3 of 7 questions, Advanced level. Aimed at the Advanced level, your current depth. Questions you have not answered yet come first.

Show all 7 questions

ScientistQuestion 1 of 3

Boron is about 20% boron-10 (mass 10.0129) and 80% boron-11 (mass 11.0093). Calculate boron's average atomic mass to two decimal places.

AdvancedQuestion 2 of 3

CIAAW gives chlorine's standard atomic weight as an interval rather than a single number because the ratio of its isotopes varies between materials.

ExpertQuestion 3 of 3

Explain the difference between an isotope's atomic mass and an element's standard atomic weight, using carbon as an example.