Scelta multipla
Mercury has several isotopes. How many neutrons are present in the most abundant isotope of mercury, Hg-202?
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2. Atoms & Elements
Isotopes
Scelta multipla
What is the atomic number of both isotopes of nitrogen?
A
7
B
14
C
15
D
8
Guida verificata passo dopo passo1
Recall that the atomic number of an element is the number of protons in the nucleus of its atoms. This number defines the element and is the same for all isotopes of that element.
Identify the element in question, which is nitrogen. The atomic number of nitrogen is a fixed value regardless of the isotope.
Understand that isotopes differ in the number of neutrons, not protons. Therefore, isotopes of nitrogen will have the same atomic number but different mass numbers.
Look up or recall the atomic number of nitrogen, which is 7. This means every nitrogen atom has 7 protons.
Conclude that both isotopes of nitrogen, such as nitrogen-14 and nitrogen-15, have an atomic number of 7.
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