Exam 11: The Chemical Elements

Use the periodic table to find the atomic number, number of protons, number of electrons, and number of valence electrons for each of the following elements. a. barium b. tin c. phosphorus

A(n) ______________ is a nonchemical combination of two or more substances in variable proportions.

Electrons in the outermost shell are referred to as ______________ electrons.

Which of the following is the symbol for an alkali metal?

About 74% by mass of Earth's crust is composed of the two elements

Name the following compounds. a. NO₂ b. N₂O₃ c. Zn(NO₃)₂ d. ICl₅ ​

A solid solution of two or more metals is called a(n) ______________.

An aqueous solution of the colorless gas HCl is called ______________.

The common name for NH₃ is ______________.

A sample of matter that contains atoms that all have the same number of protons is

Elements have similar chemical properties because they have the same number of electrons in their ______________.

The elements of Group ______________ are the most chemically active metals.

Matter can be defined as anything that ______________ ______________ and ______________ ______________.

The ______________ for compounds are written by putting the composing elements' symbols adjacent to each other, with subscripts indicating the number of atoms of each.

Take a cup of water, add sugar, and stir. If the resulting solution contains sugar crystals that do not dissolve, the solution is said to be

The elements that hardly ever react with other elements to form compounds are called the ______________.

The horizontal rows of elements in the periodic table are called

The symbol for tin is

The symbol for potassium is

The most modern definition of element is