Mass number and atomic number are two important pieces of information about a nucleus.
You are watching: An atom has 17 protons and 18 neutrons
A nucleus can be represented using the symbol notation:
Where:A is the mass numberZ is the atomic numberX is the chemical symbol of the elementA - Z = number of neutrons N
For example, chlorine (Cl) can be shown as:
(_7^14 extrmN) and (_6^14 extrmC) are not isotopes.
They have the same mass number, A, but different atomic number, Z, and different chemical symbol - they are not the same element.
If the number of protons changes, then it is a different element.Question
How many protons does (_6^14 extrmC) barisalcity.orgntain?Reveal answer
The atomic number is 6 so (_6^14 extrmC) barisalcity.orgntains six protons.
How many neutrons does (_6^14 extrmC) barisalcity.orgntain?Reveal answer
Number of neutrons = mass number - atomic number = 14 - 6 = 8 neutrons.
Write down the number of particles in the following nuclei:
<_1^3 extrmH>Reveal answer
Number of protons Z = 30Number of protons + neutrons A = 64Number of neutrons N = 64 - 30 = 34Since this is a nucleus there are no electrons
There are 30 protons and 34 neutrons.
<_92^238 extrmU>Number of protons Z = 92Number of protons + neutrons A = 238Number of neutrons N = 238 - 92 = 146Since this is a nucleus there are no electrons
There are 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 nucleus there are no electrons
There is 1 proton and 2 neutrons.
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