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Chapter 2: Q2.3CYL (page 80)

An ion of platinum has a mass number of 195 and contains 74 electrons. How many protons and neutrons does it contain and what is it鈥檚 charge ?

Short Answer

Expert verified

The number of protons present in the platinum ion is 78.

The number of neutrons present in the platinum ion is (195-78)=117.

The charge present on the ion is (78-74)= +4.

Step by step solution

01

Find the atomic number of Pt

The atomic number of Pt is 78. As atomic number = number of protons, therefore, number of protons = 78

02

Calculate the number of neutrons

We know that mass number = number of protons + number of neutrons

195 = 78 + number of neutrons

Number of neutrons= 195-78= 117

03

Calculate charge

In a neutral atom, the number of electrons = the number of protons

However, since it is an ion, the charge will be 78-74= +4

Therefore, it has a +4 charge.

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Use the build a molecule simulation (http://openstaxcollege.org/1/16molbuilding) to repeat Exercise 2.34, but build a molecule with three carbons, seven hydrogens, and one chlorine.

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