about mass numbers and atomic numbers to complete the table. name atomic number number of protons number of…

Explanation:

Step1: Recall the relationship

Mass number = Number of protons + Number of neutrons; Atomic number = Number of protons.

Step2: Calculate for helium

For helium, Mass number = 4, Number of protons = 2. Number of neutrons = Mass number - Number of protons = 4 - 2 = 2.

Step3: Calculate for carbon

For carbon, Atomic number = 6, so Number of protons = 6.

Step4: Calculate for oxygen

For oxygen, Number of protons = 8, Number of neutrons = 8, Mass number = 8 + 8 = 16, Atomic number = Number of protons = 8.

Step5: Calculate for sodium

For sodium, Number of protons = 11, Number of neutrons = 12, Mass number = 11+ 12 = 23.

Step6: Calculate for chlorine

For chlorine, Mass number = 35, Number of protons = 17. Number of neutrons = Mass number - Number of protons = 35 - 17 = 18.

Answer:

Name	Atomic Number	Number of Protons	Number of Neutrons	Mass Number
helium	2	2	2	4
carbon	6	6	6	12
oxygen	8	8	8	16
sodium	11	11	12	23
chlorine	17	17	18	35