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Unit 3 Review. Hydrogen-2 and Hydrogen-3 are : Different elements Ions Isotopes nuclei. What sub-atomic particle has a positive charge ? Neutron Proton Electron quark. An atom has 20 protons, 21 neutrons, and 18 electrons . What element is this?.

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Hydrogen-2 and Hydrogen-3 are:

  • Different elements

  • Ions

  • Isotopes

  • nuclei


What sub-atomic particle has a positive charge?

  • Neutron

  • Proton

  • Electron

  • quark




An atom has 20 protons, 21 neutrons, and 18 electrons.

Write the hyphen notation for this element.


An atom has 20 protons, 21 neutrons, and 18 electrons.

Write the nuclear symbol for this element.


If the number of an element’s electrons changed, the atom would be known as-

  • A new element

  • An ion

  • An isotope

  • A nucleus








A neutral isotope, magnesium-25, would be known has

_____ electrons

_____ protons

_____ neutrons


As an atom of F forms a F would be known -1 ion, the number of protons in its nucleus

  • Increase

  • Decreases

  • Remains the same

  • Is equal to the number of electrons


Which of the following is an extensive physical property would be known ?

  • Density

  • Mass

  • Color

  • Boiling point


Which of the following is an intensive physical property would be known ?

  • Length

  • Volume

  • Color

  • mass




2+ would be known

# of protons __________

# of neutrons__________

# of electrons__________


1- would be known

# of protons __________

# of neutrons__________

# of electrons__________


Calculate the average atomic mass of copper from the following 2 isotopes:

Cu-63 has a mass of 62.9298 amu & an abundance of 69.09%

Cu-65 has a mass of 64.9278 amu and an abundance of 30.91%


Which element is most chemically similar to following 2 isotopes:Cl?

Neon (Ne)

Iodine (I)

Sulfur (S)


The amount of energy required to release one outermost electron is called:

  • Electronegativity

  • Ionization Energy

  • Atomic Energy

  • Ionic Energy


Who discovered the nucleus by bombarding gold foil with positively charged particles?

  • Thompson

  • Dalton

  • Rutherfor

  • Bohr


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