Question

this question has multiple parts. work all the parts to get the most points. give the complete symbol $_{z}^{a}\text{x}$ for each of these atoms: a potassium with 20 neutrons b krypton with 48 neutrons c aluminium with 14 neutrons

Explanation:

Part (a)

Step1: Find atomic number of potassium

Potassium (K) has atomic number \( Z = 19 \).

Step2: Calculate mass number

Mass number \( A = \text{number of protons} + \text{number of neutrons} \). Number of protons = atomic number = 19, neutrons = 20. So \( A = 19 + 20 = 39 \).

Step3: Write the symbol

The symbol is \( \ce{_{19}^{39}K} \).

Part (b)

Step1: Find atomic number of krypton

Krypton (Kr) has atomic number \( Z = 36 \).

Step2: Calculate mass number

\( A = 36 + 48 = 84 \).

Step3: Write the symbol

The symbol is \( \ce{_{36}^{84}Kr} \).

Part (c)

Step1: Find atomic number of aluminium

Aluminium (Al) has atomic number \( Z = 13 \).

Step2: Calculate mass number

\( A = 13 + 14 = 27 \).

Step3: Write the symbol

The symbol is \( \ce{_{13}^{27}Al} \).

Answer:

s:
a. \( \boldsymbol{\ce{_{19}^{39}K}} \)
b. \( \boldsymbol{\ce{_{36}^{84}Kr}} \)
c. \( \boldsymbol{\ce{_{13}^{27}Al}} \)