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Element A has two isotopes. The first isotope is present 24.01% of the time and has a mass of 131.96 amu. The second isotope has a mass of 113.66 amu. Calculate the atomic mass of element A.
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2. Atoms & Elements
Atomic Mass
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What is the atomic number of lithium?
A
5
B
2
C
4
D
3
Guida verificata passo dopo passo1
Understand that the atomic number of an element is the number of protons in the nucleus of an atom of that element.
Recall that the atomic number is unique to each element and is used to define the element's identity.
Know that lithium is a chemical element with the symbol 'Li'.
Refer to the periodic table, where elements are listed in order of increasing atomic number.
Find lithium on the periodic table and note its position, which corresponds to its atomic number.
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