Question

using the periodic table, complete the table to describe each atom. type in your answers.
a
b
c
d
e
f

Explanation:

Step1: Recall atomic number and mass - number relationships

The atomic number (number of protons) determines the element. The mass - number is the sum of protons and neutrons.

Step2: For the first row

If the number of neutrons is 7 and the mass - number is 15, then the number of protons (A) is $15 - 7=8$. The element with 8 protons is oxygen (C = O).

Step3: For the second row

If the atomic number (number of protons, D) is 26, and the mass - number is 56, then the number of neutrons (E) is $56 - 26 = 30$. The element with 26 protons is iron (F = Fe).

Answer:

A. 8
B. 15
C. O
D. 26
E. 30
F. Fe