Question

What is the total number of neutrons in an

atom of Li?
A. 7
B. 10
C. 3
D. 4

Answer 1

D)4

Step-by-step explanation:

Lithium is an alkali metal with the atomic number = 3 and an atomic mass of 6.941 g/mol. This means that lithium has 3 protons, 3 electrons and 4 neutrons (6.941 - 3 = ~4).

Answer 2

`\boxed {\boxed {\sf D. \ 4}}`

Step-by-step explanation:

The neutrons in an element can be found by subtracting the atomic number from the atomic mass.

`\sf N=atomic \ mass- atomic \ number`

Li is the symbol for lithium.

This element has an atomic mass of 6.941, which we can round to 7.

Lithium's atomic number is 3.

`\sf atomic \ mass =7 \\atomic \ number =3`

`\sf N=7-3`

`\sf N= 4`

Lithium has a total number of 4 neutrons.