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QueenLife4869
02.08.2019 •
Chemistry
An isotope with 8 protons, 9 neutrons, and 8 electrons would have which symbol? a) 16f b) 16o c) 17f d) 17o
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Ответ:
D.![_{8}^{17}\textrm {O}](/tpl/images/0162/8071/712ce.png)
Explanation: Atomic number is the number of protons or the number of electrons.
Mass number is the sum of number of protons and number of neutrons.
Atomic number = number of electrons= number of protons = 8
Mass number = number of protons + number of neutrons= 8+9= 17
The representation of element is :
where Z= atomic number, A= mass number , X= chemical symbol of element
The representation of the element with atomic number 8 and mass number 17 is :
.
Ответ:
A metal rod would not be a good choice for roasting marshmallows because metal transfers thermal energy.
Explanation:
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