Test 2 Review (Summer School)

Which scientist described a positively charged core (“nucleus”) in the middle of a lot of empty space?

• Chadwick

• Thomson

• Rutherford

• Bohr

Which scientist described the existence of the neutron?

• Chadwick

• Thomson

• Rutherford

• Bohr

What were the main flaws in Dalton’s atomic theory? (choose all that apply)

• All elements are composed of tiny indivisible particles called atoms that cannot be broken down further.

• Atoms of different elements differ in their physical and chemical properties.

• All atoms of a given element are identical.

• In chemical reactions, atoms are combined, separated or rearranged, but not created nor destroyed.

• Atoms of different elements combine in simple, whole number ratios to form compounds.

Which of these models suggests that an atom looks like "plum-pudding" with electrons imbedded in a positively charged sphere?

• Dalton's model

• Thompson's model

• Bohr's model

• Schrödinger's model

_____ said that electron's orbit the nucleus like planets, with each orbit having a specific size and energy associated with it.

• JJ Thompson

• John Dalton

• Ernest Rutherford

• Neils Bohr

The model of the atom has changed over time

• True

• False

^{The photo above shows the isotopic notation for which isotope?}

• Carbon 12
• Carbon 13
• Carbon 14
• Carbon 15

Different isotopes have...

• different masses
• different atomic numbers
• different electrons
• different protons

Which of the following is the proper equation for determining the number of neutrons for a given isotope?

• mass # - atomic #
• atomic mass - protons
• protons + electrons
• mass # + protons

According to the isotopic notation for copper-63, how many neutrons are present in this type of atom?

• 29
• 34
• 63
• 92