Atomic Structure and Properties Q1

Which occurs if an electron transitions from n = 5 to n = 2 in a hydrogen atom?

• Energy is absorbed, and visible light is emitted.

• Energy is released, and visible light is emitted.

• Energy is released, and visible light is not emitted.

• Energy is absorbed, and visible light is not emitted.

Which isotope has the greatest number of protons?

• Pa-238

• U-240

• Np-238

• Pu-239

A neutral atom has a ground state electron configuration of 1s²2s²2p⁶3s². The neutral atom becomes an ion during a chemical reaction. Which is the most likely charge of the ion?

• 2+

• 1+

• 2–

• 6–

Which is an accurate comparison of the bonds that can occur between carbon atoms in terms of bond length and strength?

• Double bonds are shorter than single bonds, but single bonds are stronger than triple bonds.

• Triple bonds are shorter than double bonds, and double bonds are stronger than single bonds.

• Double bonds are both shorter and stronger than triple bonds.

• Triple bonds are the longest and strongest.

Which molecule contains a triple bond?

• F₂

• O₂

• Cl₂

• N₂

Which element will form covalent bonds with chlorine?

• carbon

• aluminum

• magnesium

• potassium

Which group of elements is arranged in order of increasing atomic radii?

• O, S, Se, Te

• Fe, Ni, Ag, Au

• Rb, K, Na, Li

• Y, Zr, Nb, Mo

The early periodic table organized the elements in periods of increasing atomic mass. What information helped determine the break from one period to the next?

• number of valence electrons

• chemical properties

• atomic number

• ionic radius

A change in which NEW substances are formed.

• Chemical change
• Physical change
• Casual change
• Formal change

What is the mass in grams of 5.90 mol C₈H_18?

• .0512 g
• 19.4 g
• 673 g
• 389 g