Question

number of protons, number of neutrons, atomic number, mass number, element (symbol)
a, 7, b, 15, c
d, e, 26, 56, f
using the periodic table, complete the table to describe each atom. type in your answers.
a

b

c

d

Explanation:

Step1: Recall Atomic Structure Formulas

We know that:

• Atomic Number ($Z$) = Number of Protons ($p^+$)
• Mass Number ($A$) = Number of Protons ($p^+$) + Number of Neutrons ($n^0$)

For the first row (A, B, C):

Step2: Find A (Number of Protons)

Mass Number = 15, Neutrons = 7.
Using $A = p^+ + n^0$, rearrange: $p^+ = A - n^0 = 15 - 7 = 8$. So A = 8.

Step3: Find B (Atomic Number)

Atomic Number = Number of Protons = A = 8. So B = 8.

Step4: Find C (Element Symbol)

Atomic Number 8 corresponds to Oxygen? Wait, no—Atomic Number 8 is Oxygen? Wait, no: Atomic Number 8 is Oxygen? Wait, no, wait: Atomic Number 8 is Oxygen? Wait, no, wait: Wait, Atomic Number 8 is Oxygen? Wait, no, wait, let's check: Atomic Number 8 is Oxygen? Wait, no, wait, actually, Atomic Number 8 is Oxygen? Wait, no, wait, no—wait, Atomic Number 8 is Oxygen? Wait, no, wait, no, wait: Wait, the first row: Mass Number 15, Neutrons 7, Protons 8. Atomic Number 8: element is Oxygen? Wait, no, Oxygen has atomic number 8, but mass number for Oxygen is usually 16 (8 protons + 8 neutrons). Wait, but here mass number is 15, so it's an isotope of Oxygen? Wait, no, maybe I made a mistake. Wait, Protons = 8, so atomic number 8: element is Oxygen (O). But mass number 15: 8 protons + 7 neutrons = 15. So C is O (Oxygen).

For the second row (D, E, F):

Step5: Find D (Number of Protons)

Atomic Number = 26, so Number of Protons (D) = 26.

Step6: Find E (Number of Neutrons)

Mass Number = 56, Protons = 26.
Using $n^0 = A - p^+ = 56 - 26 = 30$. So E = 30.

Step7: Find F (Element Symbol)

Atomic Number 26 corresponds to Iron (Fe).

Final Values:

• A = 8
• B = 8
• C = O (Oxygen)
• D = 26
• E = 30
• F = Fe (Iron)

Answer:

A: 8
B: 8
C: O
D: 26
E: 30
F: Fe

(Note: For C, if we recheck: Atomic Number 8 is Oxygen, but mass number 15 (8p +7n) is an isotope of Oxygen (O-15). For F, Atomic Number 26 is Iron (Fe), mass number 56 (26p +30n) is the common isotope of Iron.)