PS1.A Quiz

Which subatomic particle determines the identity of an element?

• Proton

• Neutron

• Electron

• Photon

What does the atomic number of an element represent?

• The number of neutrons in the nucleus

• The number of protons in the nucleus

• The total number of protons and neutrons

• The number of electrons in the outermost shell

Which of the following describes the arrangement of particles in a solid?

• Random and spread far apart

• Closely packed in a fixed position

• Moving freely with no definite shape

• Randomly organized and moving rapidly

What type of bond involves the sharing of electron pairs between atoms?

• Ionic bond

• Metallic bond

• Covalent bond

• Hydrogen bond

Which property is typical of ionic compounds?

• High melting points

• Poor electrical conductivity in solution

• Low boiling points

• Malleability

How is the average atomic mass of an element determined?

• By summing the protons and neutrons in the most abundant isotope

• By averaging the masses of all isotopes, weighted by their abundance

• By calculating the number of neutrons

• By dividing the atomic number by two

Which of the following determines an element’s chemical reactivity?

• Total number of neutrons

• Number of protons in the nucleus

• Number of valence electrons

• Total number of electrons

What happens to the total number of atoms during a chemical reaction?

• It decreases as atoms are destroyed.

• It increases as new atoms are created.

• It stays the same because atoms are rearranged, not created or destroyed.

• It changes depending on the type of reaction.

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Why do boiling points generally increase as molecular size increases?

• Larger molecules have more atoms to absorb heat.

• Larger molecules form stronger intermolecular forces.

• Larger molecules have higher atomic numbers.

• Larger molecules have more kinetic energy at lower temperatures.

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What trend is observed for atomic radius across a period on the periodic table?

• It increases due to the addition of protons.

• It decreases as the number of protons increases, pulling electrons closer.

• It stays constant because the number of energy levels doesn’t change.

• It fluctuates randomly based on the element.

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