Question

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

Explanation:

Step1: Determine atomic number (A and E)

The atomic number is equal to the number of protons.
For the first row, number of protons = 20, so \( A = 20 \).
For the second row, number of protons = 9, so \( E = 9 \).

Step2: Calculate mass number (B)

Mass number = number of protons + number of neutrons.
For the first row, number of protons = 20, number of neutrons = 20. So \( B=20 + 20=40 \).

Step3: Identify element (C)

Element with atomic number 20 is calcium (\( Ca \)), so \( C = Ca \).

Step4: Calculate number of neutrons (D)

Number of neutrons = mass number - number of protons.
For the second row, mass number = 19, number of protons = 9. So \( D=19 - 9 = 10 \).

Step5: Identify element (F)

Element with atomic number 9 is fluorine (\( F \)), so \( F = F \).

Answer:

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