Mat Sci 01

What is the electron configuration of Cu?

• [Ar] 4s¹ 3d¹⁰

• [Ar] 4s² 3d⁹

• [Ne] 4s² 3d⁹

• [Ar] 3s² 3d⁹

What is the type of bonding in boron carbide (BC)? The periodic table showing elemental electronegativity values may or may not be useful.

• Covalent with some ionic character

• Ionic with some covalency

• Ionic

f the potential energy described in terms of interatomic spacing in terms of the given equation wherein A and B are positive constants and m and n are whole numbers where m does not equal n, what is the equilibrium interatomic spacing?

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f the potential energy described in terms of interatomic spacing in terms of the given equation wherein A and B are positive constants, what is the equilibrium interatomic spacing?

• 3A/2A

• 3A/2B

• 3B/2A

• 2A/3B

• 2B/3A

Based on the potential energy vs. interatomic distance curves shown, which of the following statements is TRUE?

• Z has the lowest bond length

• Z has larger Young’s modulus than Y

• None of these choices

• Z has the intermediate coefficient of thermal expansion

• X has the highest melting point

Which kind of bonding is present in all solid materials?

• Ionic

• Metallic

• van der Waals

• Dipolar

• Covalent

Based on the given potential energy vs. interatomic distance plot, which of the following statements is TRUE?

• At point 1, the attractive force exceeds the repulsive force.

• At point 2 the attractive force and repulsive forces exactly equal to each other.

• At point 4, the repulsive force exceeds the attractive force.

• At point 3, the attractive force exceeds the repulsive force.

• None of these choices.

The Mg²⁺ ion has an electron structure that is identical to which inert gas?

• Neon

• Xenon

• Krypton

• Argon

What type(s) of bonding would be expected for rubber?

• Covalent bonding with some van der Waals bonding

• Van der Waals bonding

• Ionic bonding

• Metallic bonding

What are the indices of the direction (arrow) shown in the unit cell.

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