Exam 11: The Chemical Elements

About 75% of the mass of the visible universe is composed of which element?

Neptunium is an example of

An atom that has more protons than electrons is a ______________ ion.

An electrically neutral particle composed of two or more atoms chemically combined is called a(n)______________.

The major credit for the development of the periodic table goes to a scientist named ______________.

A chemical combination of two or more substances in variable proportions is called

How many elements occur naturally on Earth?

The second most abundant element in the Earth's atmosphere is

Which of the following polyatomic ions has a single minus charge?

Which of the following is the shell electron configuration for sulfur?

In a neutral atom,the number of protons is equal to the number of ______________.

Which of the following,along with O₂,is an allotrope of oxygen?

The hydroxide ion has a charge of

Homogeneous mixtures are

A metal alloy,such as steel,is

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

A(n)______________ is a substance composed of two or more elements chemically combined in a definite,fixed proportion by mass.

The three allotropes of carbon are graphite,the fullerenes,and ______________.

A solution that contains more dissolved solute than its normal solubility is called a(n)______________ solution.

Give the common ionic charge for each of the following elements,and classify each as a metal or a nonmetal. lithium_____________             _______________ bromine_____________          _______________ cal cium__________________      _________________ sulfur________________          _______________________ aluminum_____________          ___________________ ​