Chem - Sem 2 exam

In a periodic table, a set of properties repeats from

• element to element.
• group to group.
• column to column.
• row to row.

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.

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

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

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 unit for atomic mass is

• gram
• amu
• pound
• none of these

Which list of elements contains only metals?

• Cu, I, Al

• Sn, Al, Cs

• He, Fe, Cu
• I, C, Ar

At room temperature, none of the metals are

• soft
• liquids
• malleable
• gases

Which general statement does NOT apply to metals?

• Most metals are ductile.
• Most metals are malleable.
• Most metals are brittle.
• Most metals are good conductors of electric current.

What is the electron configuration of Cu