Question

complete the following information for chlorine

of protons # of electrons # of neutrons total number of particles group period

17 17
complete the following information for argon

of protons # of electrons # of neutrons total number of particles group period

18 18 22 58 8 3

Explanation:

Step1: Recall Chlorine's properties

Chlorine has atomic number 17. In a neutral atom, number of protons = number of electrons = 17. The most common isotope of chlorine has a mass - number of 35. Mass - number = number of protons+number of neutrons. So number of neutrons = 35 - 17=18. Total number of particles = protons + electrons+neutrons = 17 + 17+18 = 52. Chlorine is in group 17 and period 3.

Step2: Recall Argon's properties

Argon has atomic number 18. In a neutral atom, number of protons = number of electrons = 18. Given number of neutrons = 22. Total number of particles = 18 + 18+22 = 58. Argon is in group 18 and period 3.

Answer:

Element	# of Protons	# of Electrons	# of Neutrons	Total Number of Particles	Group	Period
Argon	18	18	22	58	18	3