Chemistry Mid

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

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.

Which answer below best describes all atoms of a particular element?

• They possess the same number of electrons, the same atomic number, the same mass, but nothing else in common.

• They possess the same mass and the same chemical properties, but nothing else in common.

• They possess the same number of electrons, the same atomic number, the same chemical properties, but not necessarily the same mass.

• They possess the same chemical properties and the same mass, but nothing else in common.

• They possess the same atomic number and the same mass, but have nothing else in common.

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

Which description below fits the 65Cu atom?

• 29 protons, 65 neutrons, 29 electrons

• 29 protons, 36 neutrons, 65 electrons

• 29 protons, 36 neutrons, 31 electrons

• 29 protons, 36 neutrons, 29 electrons

• 31 protons, 34 neutrons, 29 electrons

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

In which family of elements does Ca belong?

• alkali metals

• alkaline earth metals

• halogens

• noble gases

• transition metals