Chemistry Quiz

Which one of the following contributes to the charge, but does NOT contribute significantly to the mass of an atom?

• electrons

• nuclei

• photons

• neutrons

• protons

Consider the atoms of Cu-65 and Zn-65. Both of these atoms have the same

• number of electrons

• number of ions

• number of neutrons

• mass number

• number of protons

Uranium exists in nature in the form of several isotopes; the different isotopes have different

• atomic numbers

• charges

• numbers of electrons

• numbers of neutrons

• numbers of protons

Consider the atoms of Co and Co. Both of these atoms have the same

• number of neutrons and electrons

• number of neutrons and ions

• mass number

• number of photons

• number of protons and electrons

A neutral iodine atom has an atomic mass number = 131. Which description below fits this atom?

• 39 protons, 78 neutrons, 39 electrons

• 53 protons, 78 neutrons, 53 electrons

• 52 protons, 79 neutrons, 54 electrons

• 53 protons, 131 neutrons, 53 electrons

• 54 protons, 131 neutrons, 54 electrons

A naturally occurring element consists of three isotopes. The data for the isotopes are: isotope 1: 146.9672 u, 64.792% isotope 2: 148.9638 u, 26.117% isotope 3: 149.9592 u, 9.0910%. What is the average atomic mass of this naturally occurring element?

• 49.254 u

• 147.76 u

• 148.63 u

• 148.67 u

• 147.88 u

All of the following are alkali metals except

• Sr

• Na

• Fr

• Cs

• Rb

Which element is a halogen?

• Te

• O

• Se

• Uuh

• I

Each statement accurately describes the noble gases except for which one?

• They were once known as the inert gases.

• He, Ne, Ar, Kr, Xe, Rn, and Uuo are part of the group.

• Their heavier elements do react with other elements.

• They belong to group VIIIA (or 18).

• They contain at least one metalloid.

The transition metals take up ___ periods of the periodic table.

• 2

• 3

• 4

• 1

• 5