Question

The atomic number of lithium is 3. How many neutrons does an atom of lithium have if it is represented by the symbol shown below? 7Li

Answer 1

Answer:

lithium atomic number is 3

atomic number is represented by either no. of protons or no. of electrons. a/c to above statement no. of protons=3

no. of electrons=3

atomic mass number=protons+neutrons

7=3+n

n=7-3

=4

so no. of neutrons in Lithium=4

zXA

3Li7

Answer 2

Answer:

4 neutrons are present