Exam 11: The Chemical Elements

The second shell of an atom can hold a maximum of ______________ electrons.

Which of the following Group 1A elements has the smallest atom?

Hydrogen, nitrogen, and chlorine are among the elements that occur as molecules made up of ______________ atoms.

An example of a diatomic molecule of an element is

Which of the following polyatomic ions has a doubly negative charge?

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

Solutions are

Neptunium is an example of

The electrons in the outermost shell are called ______________ electrons.

Which of the following Period 3 atoms has the smallest radius?

Pencil "lead" (graphite) is made primarily of

Elements in Period 2 of the periodic table have electrons in how many shells?

Which of the following Period 4 elements has the smallest atom?

When the atoms of two or more elements react chemically, they usually join together to form

About 15% by mass of Earth's core is composed of the element(s)

Which of the following is a positively charged polyatomic ion?

Which group is the nearest neighbor to the noble gases in the periodic table?

The pale-green, gaseous element named ______________ was used as a poisonous gas in World War I.

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

Which of the following is a negatively charged polyatomic ion?