Mass number and also atomic number are two necessary pieces the information around a nucleus.
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A nucleus deserve to be represented using the prize notation:
<_Z^A extrmX>
Where:
A is the mass numberZ is the atomic numberX is the chemical symbol the the elementA - Z = number of neutrons NFor example, chlorine (Cl) have the right to be presented as:

(_7^14 extrmN) and also (_6^14 extrmC) room not isotopes.
They have actually the same mass number, A, yet different atomic number, Z, and also different chemistry symbol - they are not the exact same element.
If the variety of protons changes, climate it is a different element.
QuestionHow numerous protons go (_6^14 extrmC) chrischona2015.orgntain?
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The atomic number is 6 so (_6^14 extrmC) chrischona2015.orgntains six protons.
How chrischona2015.orguntless neutrons walk (_6^14 extrmC) chrischona2015.orgntain?
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Number of neutrons = mass number - atom number = 14 - 6 = 8 neutrons.
Write down the variety of particles in the adhering to nuclei:
<_30^64 extrmZn>
<_92^238 extrmU>
<_1^3 extrmH>
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<_30^64 extrmZn>
There room 30 protons and also 34 neutrons.
<_92^238 extrmU>
Number of protons Z = 92Number of protons + neutron A = 238Number of neutrons N = 238 - 92 = 146Since this is a cell chrischona2015.orgre there space no electronsThere room 92 protons and 146 neutrons.
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<_1^3 extrmH>
Number of protons Z = 1Number of protons + neutrons A = 3Number of neutrons N = 3 - 1 = 2Since this is a cell nucleus there are no electronsThere is 1 proton and also 2 neutrons.
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