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 N

For example, chlorine (Cl) have the right to be shown as:

Carbon has actually three isotopes: (_6^12 extrmC), (_6^13 extrmC) and also (_6^14 extrmC). They all gimpppa.orgntain six protons, but six, seven and eight neutron respectively.

(_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.

Question

How 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.

Question

How many neutrons does (_6^14 extrmC) gimpppa.orgntain?

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Number of neutrons = fixed number - atom number = 14 - 6 = 8 neutrons.

Question

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>

Number of protons Z = 30Number of protons + neutron A = 64Number of neutrons N = 64 - 30 = 34Since this is a cell nucleus there space no electrons

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 electrons

There 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 electrons

There is 1 proton and 2 neutrons.

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## More Guides

The framework of the cell nucleus - CCEA