Concept explainers
Interpretation:
The blanks in the table are to be filled.
Concept introduction:
The
The number of electrons in a neutral atom is exactly equal to the number of protons.
The mass number of an atom
Here,
Answer to Problem 99AP
Solution:
Explanation of Solution
For the first element,
Number of protons
Number of electrons
Number of neutrons
For the given element, thenumbers of protons and electrons are equal, so it is a neutral atom. Its atomic number is the number of protons. So, the atomic number of this element is
Substitute
The mass number is
Hence, thesymbol is
For the second element, the symbol given is
The atomic number of iron is
Substitute
The number of neutrons is
For the third element,
Number of neutrons
Number of electrons
Net charge on the element is
This element has gained three electrons, so the number of protons becomes
Substitute
The mass number is
Hence, the symbol is
For the fourth element,
Number of protons
Number of electrons
Number of neutrons
Thenumbers of protons and electrons are equal, so it is a neutral atom. The atomic number is equal to the number of protons. So, the atomic number of this element is
Substitute
The mass number is
Hence, the symbol is
For the fifth element,
Number of protons
Number of neutrons
Net charge
The net charge is zero, so it is a neutral atom. The number of electrons is equal to the number of protons, that is,
Substitute
The mass number is
Hence, the symbol is
The blanks in the given table are filled as shown below:
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Chapter 2 Solutions
Chemistry
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