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IDevice Icon Objectives
Indicated the number of fundamental particles in any given isotope or atom.

IDevice Question Icon Atomic Structure: The number of fundamental particles in an atom or isotope.

Carbon-14 is the radioactive isotope of carbon that is used in radiocarbon dating.

How many neutrons in this isotope
       
14
6
8
12

The number of electrons present in an atom of chromium-52 is
  
24 because the electrons are positive like protons.
24 because the electrons are negative to balance the positive protons.
28 because electrons are positive like the neutrons.
28 because electrons are negative to balance the positive neutrons.

Isotopes are atoms of the same element with different mass numbers.
This means that isotopes will
  
have the same number of protons but different numbers of neutrons.
have the same number of protons but different numbers of electrons.
have the same number of neutrons but different numbers of protons.
have the same number of neutrons but different numbers of electrons.

One isotope of magnesium has 12 neutrons and another has 14 neutrons.
The difference between the two isotopes is that
       
the isotope with 14 neutrons is unstable.
the isotope with 14 neutrons has a larger atomic number.
the isotope with 12 neutrons has a larger mass number
to balance the smaller number of neutrons.
the isotope with 12 neutrons has a smaller mass number,
since atomic number and neutrons are combined to make the mass number.

It was determined that a substance is composed of one isotope, which has 50 neutrons
and 40 electrons. What is the isotope?
       
Tin-90
Tin-40
Zirconium-90
Zirconium-50

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