Question

4. An ion of iron has an 26 protons, 30 neutrons, and 23 electrons. What are its atomic number, atomic mass, and net charge?
A. atomic number = 26, atomic mass = 56, net charge = 3+
B. atomic number = 26, atomic mass = 56, net charge = 3-
C. atomic number = 30, atomic mass = 56, net charge = 3+
D. atomic number = 56, atomic mass = 26, net charge = 3-

Answer 1

Given:

Number of protons in ion of iron = 26

Number of neutrons in ion of iron = 30

Number of electrons in ion of iron = 23

To find:

Atomic number =?

Atomic mass = ?

Net charge = ?

Formula to be used:

Atomic number = Number of protons

Atomic mass = Number of protons + Number of neutrons

Net charge = Number of protons + Number of electrons

Calculation:

1. Atomic number:

Atomic number = Number of protons

Given that, number of protons in ion of iron = 26

Therefore,

Atomic number = 26

2. Atomic mass:

Atomic mass = Number of protons + Number of neutrons

Given that,

Number of protons in ion of iron = 26

Number of neutrons in ion of iron = 30

Atomic mass = 26 + 30

Atomic mass = 56

3. Net charge

Net charge = Number of protons + Number of electrons

Given that,

Number of protons in ion of iron = 26

Number of electrons in ion of iron = 23

Net charge = 26 - 23

Net charge = +3

Final answer:

Atomic number = 26

Atomic mass = 56

Net charge = +3 or +3

Thus, option A is correct.