Question

number of protons
20
9
number of neutrons
20
d
atomic number
a
e
mass number
b
19
element (symbol)
c
f
using the periodic table, complete the table to describe each atom. type in your answers.
a
b
c
d

Explanation:

Step1: Find A (Atomic Number for first atom)

Atomic number equals number of protons. So \( A = 20 \).

Step2: Find B (Mass Number for first atom)

Mass number = protons + neutrons. So \( B = 20 + 20 = 40 \).

Step3: Find C (Element for first atom)

Atomic number 20 is Calcium (Ca).

Step4: Find D (Neutrons for second atom)

Mass number = protons + neutrons, so neutrons \( D = 19 - 9 = 10 \).

Step5: Find E (Atomic Number for second atom)

Atomic number equals number of protons, so \( E = 9 \).

Step6: Find F (Element for second atom)

Atomic number 9 is Fluorine (F).

Answer:

A: 20
B: 40
C: Ca
D: 10
E: 9
F: F