Question

question 3. complete the table for the following elements.
element: chlorine, potassium, carbon
atomic number
mass number: 35, 12
number of protons: 17
number of electrons
number of neutrons: 20
exit ticket 12 (module 3 - lesson 2)
possible points: 20

Explanation:

Step1: Recall atomic number is number of protons

For chlorine, atomic number = 17. For potassium, atomic number = 19. For carbon, atomic number = 6.

Step2: Recall number of electrons equals number of protons in neutral atom

Chlorine has 17 electrons, potassium has 19 electrons, carbon has 6 electrons.

Step3: Calculate number of neutrons

Number of neutrons = Mass number - Atomic number. For chlorine, number of neutrons = 35 - 17=18. For potassium, mass number is not given but if we assume a common isotope, potassium - 39, number of neutrons = 39 - 19 = 20. For carbon, number of neutrons = 12 - 6 = 6.

Answer:

Element	Atomic Number	Mass Number	Number of Protons	Number of Electrons	Number of Neutrons
Potassium	19	(assumed 39)	19	19	20
Carbon	6	12	6	6	6