Unit 2: The Atom

Which subatomic particles make up the atom?

• Protons, neutrons, and electrons

• Electrons and photons

• Neutrons and neutrinos

• Protons and positrons

Which subatomic particle represents the atomic number and the true identity of any element atom?

• Neutron

• Electron

• Proton

• Photon

What is needed to identify the number of protons, neutrons, and electrons for any element?

• Atomic mass

• Isotopic symbol

• Valence electrons

• Ion charge

How can you calculate the number of electrons in an atom?

• By knowing the atomic mass

• Using the Periodic Table

• By knowing the charge and atomic number

What results when an atom gains or loses valence electrons?

• A new element

• A molecule

• An ion

• A compound

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What is an isotope?

• An atom with a different number of electrons

• An atom with a different number of protons

• An atom with a different number of neutrons

• An atom with a different number of photons

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How is the average atomic mass of an element calculated?

• By adding the mass numbers of each isotope

• By taking the sum of the relative abundances multiplied by the masses of isotopes

• By subtracting the number of neutrons from protons

• By dividing the atomic number by the mass number

What is half-life?

• The time it takes for a substance to double in mass

• The time it takes for half of a substance to undergo nuclear decay

• The time it takes for a substance to lose all its energy

• The time it takes for a substance to become stable

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What can half-life be used to determine?

• The amount of energy released in a reaction

• The amount of a radioactive substance remaining after a period

• The speed of a chemical reaction

• The stability of an isotope

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What type of radiation can nuclear decay emit?

• Alpha, beta, and gamma

• Delta, epsilon, and zeta

• Sigma, tau, and omega

• Muon, pion, and kaon

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