The Periodic Table of Elements

Dmitri Mendeleev organized the chemical elements:

• a.by number of electrons
• b.by increasing atomic weight and similar properties
• c.by increasing atomic number and similar properties
• d.in alphabetical order

The elements in the present periodic table are arranged according to their:

• a.atomic masses
• b.mass number
• c.atomic number
• d.atomic weight

A vertical column in the periodic table is called a:

• a.valence
• b.branch
• c.group
• d.period

A horizontal row in the periodic table is called a:

• a.shells
• b.branch
• c.group
• d.period

The majority of the elements in the periodic table are:

• a.noble gases
• b.nonmetals
• c.metalloids
• d.metals

What does Bohr's theory state?

• a.Electrons occur around the nucleus in electron shells that have a limited capacity
• b.Electrons are located randomly around an atom's nucleus
• c.Electrons occur in shells of unlimited capacity
• d.Electrons don't occur at all in atoms

What is the capacity of the first electron shell?

• a.sixteen
• b.eight
• c.three
• d.two

Which of the following is the electron configuration for carbon:

• a.C )2e- )8e- )2e-
• b.C )2e- )6e-
• c.C )2e- )4e-
• d.Ca )2e- )8e- )2e-

Elements in the some group have:

• a.similar symbols
• b.the same number of neutrons
• c.the same number of valence electrons
• d.the same number of electrons

Elements in the same period have:

• a.the same number of neutrons
• b.gradually changing properties
• c.similar symbols
• d.identical chemical properties

Which element is classified as metalloid?

• a.Ca
• b.Cl
• c.Si
• d.Zn

How many valence electrons does calcium have?

• a.one
• b.two
• c.eight
• d.twenty

How many valence electrons does boron have?

• a.one
• b.two
• c.three
• d.four