Question

1. fill in the rest of the chart.

Explanation:

Step1: Recall element - related facts

For potassium ion ($K^+$), atomic number of K is 19, mass number is 39 (common). So neutrons = 39 - 19=20, electrons = 18 (lost 1 for + charge).

Step2: Analyze carbon - 14

Atomic number of C is 6, neutrons = 14 - 6 = 8, electrons = 6.

Step3: For arsenic

Atomic number is 33, neutrons = 75 - 33 = 42.

Step4: For atomic number 28

Element is nickel (Ni), mass number not given but assume common 59, neutrons = 59 - 28 = 31, electrons = 28.

Step5: For krypton

Atomic number 36, neutrons = 80 - 36 = 44, electrons = 36.

Step6: For atomic number 9

Element is fluorine (F), mass number 19, neutrons = 19 - 9 = 10, electrons = 9.

Answer:

Ion/Isotope	Element Name	Atomic Number	Mass Number (P + N)	Protons	Neutrons	Electrons
C - 14	Carbon	6	14	6	8	6
Arsenic	Arsenic	33	75	33	42	33
-	Nickel	28	59	28	31	28
Krypton	Krypton	36	80	36	44	36
-	Fluorine	9	19	9	10	9