Unit 3 review
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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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Unit 3 Review

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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?


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

What is this element’s mass #?


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


What is the name of Group 1?


What is the name of Group 2?


What is the name of Group 17?


What is the name of Group 18?


Convert 0.030L to scientific notation.


Lead-207 has ______ neutrons.


A neutral isotope, magnesium-25, has

_____ electrons

_____ protons

_____ neutrons


As an atom of F forms a F-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?

  • Density

  • Mass

  • Color

  • Boiling point


Which of the following is an intensive physical property?

  • Length

  • Volume

  • Color

  • mass


Where in the atom can electron NOT be found?


What is the atomic number for aluminum?


2+

# of protons __________

# of neutrons__________

# of electrons__________


1-

# 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 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


  • Login