Mass number and also atomic number are two necessary pieces the information around a nucleus.
You are watching: What element has 18 protons and 20 neutrons
A nucleus deserve to be represented using the prize notation:
<_Z^A extrmX>
Where:
A is the fixed numberZ is the atom numberX is the chemistry symbol the the elementA - Z = variety of neutrons NFor example, chlorine (Cl) have the right to be shown as:
(_7^14 extrmN) and (_6^14 extrmC) space not isotopes.
They have actually the exact same mass number, A, yet different atom number, Z, and also different chemical symbol - they are not the same element.
If the variety of protons changes, climate it is a different element.
QuestionHow numerous protons walk (_6^14 extrmC) gimpppa.orgntain?
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The atomic number is 6 therefore (_6^14 extrmC) gimpppa.orgnsists of six protons.
How many neutrons does (_6^14 extrmC) gimpppa.orgntain?
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Number of neutrons = fixed number - atom number = 14 - 6 = 8 neutrons.
Write down the number of particles in the adhering to nuclei:
<_30^64 extrmZn>
<_92^238 extrmU>
<_1^3 extrmH>
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<_30^64 extrmZn>
There are 30 protons and 34 neutrons.
<_92^238 extrmU>
Number of proton Z = 92Number of protons + neutron A = 238Number of neutron N = 238 - 92 = 146Since this is a cell gimpppa.orgre there space no electronsThere room 92 protons and 146 neutrons.
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<_1^3 extrmH>
Number of proton Z = 1Number of protons + neutron A = 3Number of neutron N = 3 - 1 = 2Since this is a nucleus there room no electronsThere is 1 proton and 2 neutrons.
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