Multiple Choice
If you were told that concentrations of trace elements above what is required by organisms generally have no effect on those organisms, what would you say?
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2. Chemistry
Atoms- Smallest Unit of Matter
Multiple Choice
A neutral atom of chlorine has an atomic number of 17. It has __________ electrons in its third shell.
A
2
B
17
C
7
D
8
Verified step by step guidance1
Identify the atomic number of chlorine, which is 17. This number represents the total number of protons and, in a neutral atom, also the total number of electrons.
Understand the electron configuration principle, which states that electrons fill orbitals starting from the lowest energy level to the highest.
Recall the order of filling electron shells: the first shell can hold up to 2 electrons, the second shell can hold up to 8 electrons, and the third shell can hold up to 18 electrons.
Calculate the distribution of electrons: the first shell will have 2 electrons, the second shell will have 8 electrons, totaling 10 electrons in the first two shells.
Subtract the number of electrons in the first two shells from the total number of electrons (17) to find the number of electrons in the third shell: 17 - 10 = 7 electrons in the third shell.
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