Q2.3CYL
Question
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’s charge ?
Step-by-Step Solution
Verified Answer
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.
1Step 1: Find the atomic number of Pt
The atomic number of Pt is 78. As atomic number = number of protons, therefore, number of protons = 78
2Step 2: 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
3Step 3: 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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