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Chapter 3: Problem 33

Calculate the number of electrons of the atom whose mass number is 75 and whose number of neutrons is 42.

Short Answer

Expert verified
The number of electrons in the atom is 33.

Step by step solution

01

Determine the Number of Protons

Knowing that the mass number is the total number of protons and neutrons, subtract the number of neutrons from the mass number to find the number of protons. Here we use the formula: Number of Protons = Mass Number - Number of Neutrons. Plugging in the given values, we get: \( Number\:of\:Protons = 75 - 42 = 33 \).
02

Determine the Number of Electrons

In a neutral atom, the number of protons is equal to the number of electrons. So therefore, the number of electrons in this atom is 33.

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Most popular questions from this chapter

Many elements exist as polyatomic molecules. Use atomic masses to calculate the molecular masses of the following: \begin{equation} \begin{array}{l}{\text { a. } \mathrm{O}_{2}} \\ {\text { b. } \mathrm{P}_{4}} \\ {\text { c. } \mathrm{S}_{8}}\end{array} \end{equation}

Write nuclear symbols for isotopes of uranium that have the following numbers of neutrons. The atomic number of uranium is 92. \begin{equation} \begin{array}{l}{\text { a. } 142 \text { neutrons }} \\ {\text { b. } 143 \text { neutrons }} \\ {\text { c. } 146 \text { neutrons }}\end{array} \end{equation}

Why does an electron occupy the 4s orbital before the 3\(d\) orbital?

Calculate the number of neutrons of the atom whose atomic number is 42 and whose mass number is 96.

What is a cathode?
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