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Questions and Answers
How many neutrons does an atom of lithium have if it is represented by the symbol 7Li?
4 neutrons
How many electrons does an ion of fluorine have if it is represented by the symbol 19F1-?
10 electrons
Which symbol represents a chlorine ion with a stable arrangement of eight valence electrons?
35Cl1-
What are the atomic number, atomic mass, and net charge of an ion of iron with 26 protons, 30 neutrons, and 23 electrons?
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What would be formed if one proton is added to a lithium atom containing 3 protons, 4 neutrons, and 3 electrons?
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Study Notes
Lithium
- Atomic number of lithium is 3, indicating it has 3 protons.
- The isotope of lithium represented as 7Li has 4 neutrons, calculated as atomic mass (7) minus atomic number (3).
Fluorine
- Atomic number of fluorine is 9, indicating it has 9 protons.
- An ion of fluorine, represented as 19F1-, has gained an extra electron, resulting in a total of 10 electrons.
Chlorine
- Chlorine has an atomic number of 17, suggesting it has 17 protons.
- A stable ion of chlorine, represented as 35Cl1-, has eight valence electrons indicating it has gained one electron for stability.
Iron Ion
- An ion of iron has 26 protons, making its atomic number 26.
- It has 30 neutrons leading to an atomic mass of 56 (26 protons + 30 neutrons).
- The net charge is 3+ due to the presence of 23 electrons, resulting in a positively charged ion.
Beryllium Ion
- A lithium atom with 3 protons, 4 neutrons, and 3 electrons will become a beryllium ion if one proton is added.
- This addition alters the element from lithium to beryllium, which has an atomic number of 4.
Studying That Suits You
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Description
Test your knowledge of atomic structure with these flashcards based on the Element Builder Gizmo. Each card presents a challenge involving atomic numbers, neutrons, electrons, and electron dot diagrams. Perfect for students looking to reinforce their understanding of chemistry concepts.
