Science Reviewer

Which is true about the elements in a particular group in the periodic table?

• they have the same number of protons.

• they have the same number of electrons.

• they have the same number of energy levels.

• they have the same number of valence electrons.

Why do atoms gain, lose, or share electrons?

• Atoms should weigh less.

• Atoms should interact with other atoms

• Atoms should have lesser electrons.

• Atoms should be stable.

What do we mean by stable configuration?

• having 5 electrons in the outermost shell

• having 6 electrons in the outermost shell

• having 7 electrons in the outermost shell

• having 8 electrons in the outermost shell

A student claims that sulfur (S) has a stable electron configuration. Which of the following best evaluates this statement?

• Correct, because sulfur has 16 electrons, filling the third energy level

• Incorrect, because sulfur only has 6 valence electrons and needs 2 more to complete its octet

• Correct, because sulfur has an equal number of protons and electrons

• Incorrect, because sulfur does not have any paired electrons in its orbitals

What do you call the bond between two nonmetals?

• Covalent bond

• Ionic bond

• Metallic bond

• James Bond

Which is NOT a property of covalent compound?

• It has low melting point

• It exists in a stable crystalline structure.

• It does not exhibit any electrical conductivity.

• It is usually solid at normal temperature and pressure.

Which statement correctly differentiates between polar and nonpolar covalent bonds?

• Polar covalent bonds involve equal sharing of electrons, while nonpolar covalent bonds involve electron transfer.

• Polar covalent bonds involve unequal sharing of electrons, while nonpolar covalent bonds involve equal sharing.

• Nonpolar covalent bonds occur between metals, while polar covalent bonds occur between nonmetals.

• Nonpolar covalent bonds conduct electricity, while polar covalent bonds do not.

What do you call a 'charged atom'?

• Ions

• Protons

• Electrons

• Photons

A scientist is testing an unknown solid. It has a high melting point, dissolves in water, and conducts electricity when dissolved. Based on these properties, what type of bonding is most likely present?

• Covalent

• Metallic

• Ionic

• Hydrogen

What type of element should bond together to form an ionic compound?

• Metal and Nonmetal

• Metal and Metalloids

• Nonmetal and metalloid

• Nonmetal and another Nonmetal