Physical Science Chapter 5

Mendeleev arranged the known chemical elements in a table according to increasing

• atomic number
• number of electrons
• number of protons
• mass

Mendeleev gave the name eka-aluminum to a(an)

• compound containing aluminum.
• mixture of aluminum and an unknown element.
• unknown element he predicted would have properties similar to those of aluminum.
• rare isotope of aluminum.

The usefulness of Mendeleev�s periodic table was confirmed by

• the discovery of subatomic particles.
• its immediate acceptance by other scientists.
• the discovery of elements with predicted properties.
• the discovery of the nucleus.

Figure 5-1 shows a portion of a blank periodic table. Identify the segments labeled A and B.

• A and B are both periods.
• A is a period and B is a group.
• A and B are both groups.
• A is a group and B is a period.

Moving from left to right across a row of the periodic table, which of the following values increases by exactly one from element to element?

• isotope number
• atomic number
• atomic mass unit
• mass number

The atomic mass of an element is

• the sum of the protons and neutrons in one atom of the element.
• twice the number of protons in one atom of the element.
• a ratio based on the mass of a carbon-12 atom.
• a weighted average of the masses of an element�s isotopes.

One twelfth the mass of a carbon-12 atom is used to define a(an)

• atomic number
• atomic mass
• mass number
• atomic mass unit

The unit for atomic mass is

• gram
• amu
• pound
• none of the above

Which list of elements contains only metals?

• carbon, iodine, tin
• tin, copper, cesium
• helium, iron, copper
• helium, lead, bromine

Which statement is true about the metalloid silicon?

• Silicon is a better conductor of electric current than silver is.
• Silicon does not conduct electric current under any conditions.
• Silicon's ability to conduct electric current does not vary with temperature.
• Silicon is a better conductor of electric current than sulfur is.