Lithium, is used in dry cells and storage batteries and in high temperature lubricants, it has two naturally occurring isotopes, 6li and 7li. calculate the atomic mass of lithium.

The average atomic mass of lithium is 6.9241 u.

Explanation:

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

....(1)

Mass of isotope = 6 u

Percentage abundance of isotope = 7.59 %

Fractional abundance of isotope = 0.0759

Mass of isotope = 7 u

Percentage abundance of isotope = 92.41%

Fractional abundance of isotope = 0.9241

Putting values in equation 1, we get:

Hence, the average atomic mass of lithium is 6.9241 u.

a small container that holds a source of energy a solar cell that captures light energy and converts it into electricity a voltaic cell that uses the oxidation of a fuel to produce electricity

explanation:

the answer is na (sodium)