The Periodic Table of Elements | Chemistry | Quiz

Dmitri Mendeleev organized the chemical elements:

by number of electrons

by increasing atomic weight and similar properties

by increasing atomic number and similar properties

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

atomic masses

mass number

atomic number

atomic weight
A vertical column in the periodic table is called a:

valence

branch

group

period
A horizontal row in the periodic table is called a:

shells

branch

group

period
The majority of the elements in the periodic table are:

noble gases

nonmetals

metalloids

metals
What does Bohr's theory state?

Electrons occur around the nucleus in electron shells that have a limited capacity

Electrons are located randomly around an atom's nucleus

Electrons occur in shells of unlimited capacity

Electrons don't occur at all in atoms
What is the capacity of the first electron shell?

sixteen

eight

three

two
Which of the following is the electron configuration for carbon:

C )2e- )8e- )2e-

C )2e- )6e-

C )2e- )4e-

Ca )2e- )8e- )2e-
Elements in the some group have:

similar symbols

the same number of neutrons

the same number of valence electrons

the same number of electrons
Elements in the same period have:

the same number of neutrons

gradually changing properties

similar symbols

identical chemical properties
Which element is classified as metalloid?

Ca

Cl

Si

Zn
How many valence electrons does calcium have?

one

two

eight

twenty
How many valence electrons does boron have?

one

two

three

four