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Chapter 2: Q39P (page 82)

Argon has three naturally occurring isotopes, 36Ar,38Ar, and
40Ar. What is the mass number of each? How many protons, neutrons, and electrons are present in each?

Short Answer

Expert verified
  • The Mass number: 36Ar(36), 38Ar (38), 40Ar(40)
  • Number of protons: 36Ar(18), 38Ar (18), 40Ar(18)
  • Number of neutron: 36Ar(18), 38Ar (20), 40Ar(22)
  • Number of electrons: 36Ar(18), 38Ar (18), 40Ar(18)

Step by step solution

01

Isotopes

The isotopes of an element are atoms that have different mass number but same atomic number.

02

Number of protons, neutrons and electrons

Number of protons = Number of electrons = Atomic number

Number of neurons = Mass number - Atomic number

Isotopes

Mass number

Number of
protons

Number of
neutrons

Number of
electrons

36Ar

36

18

18

18

38Ar

38

18

20

18

40Ar

40

18

22

18

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Most popular questions from this chapter

The mass percent of sulfur in a sample of coal is a key factor in the environmental impact of the coal because the sulfur combines with oxygen when the coal is burned and the oxide can then be incorporated into acid rain. Which of the following coals would have the smallest environmental impact?

Mass (g) of Sample

Mass(g) of Sulfur in Sample

Coal A

378

11.3

Coal B

495

19.0

Coal C

675

20.6

The following charges on individual oil droplets were obtained during an experiment similar to Millikan's. Determine a charge for the electron( in coulombs), and explain your answer:
-1.602×1019C; -4.806×10-19C; -8.010×10-19C; -14.42×10-19C.

Choose the correct answer. The difference between the mass number of an isotope and its atomic number is (a)directly related to the identity of the element; (b) the number of electrons; (c) the number of neutrons; (d) the number of isotopes.

What are some characteristic properties of elements to the left of the elements along the “staircase”? To the right?

For what type(s) of compound do we use Greek numerical prefixes in the name?
See all solutions

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