Classes of Elements

True

(True or False) All metalloids are solids at room temperature.

It should placed in the nonmetal class because nonmetals tend to be gases at room temperature and most are extremely

A certain element is a gas at room temperature and extremely reactive with other elements. In which class of elements do you think the element should be placed?

C) cannot conduct electricity

A nonmetal is an element that A) exists only a gas or liquid B) is completely unreactive C) cannot conduct electricity D) is shiny and malleable

Solid

Almost all metals are in the _________ state at room temperature.

Nonmetal

Carbon and oxygen are elements in the ________ class.

True

Elements with eight valence electrons are unreactive.

Metals are ductile, malleable, and good conductors of electricity making them perfect tools for cooking and electrical purposes.

Explain why metals are used to make objects such as frying pans and electric wires.

False

Fluorine is an example of a metalloid.

B) be formed into sheets without breaking

If an element is malleable, this means it can A) be formed into long thin shapes like wires B) be formed into sheets without breaking C) be used to conduct electric current D) be used as an electric insulator

C) ductile

Most metals are A) dull B) brittle C) ductile D) all of the above

True

Nonmetals are the second largest class of elements.

False

Nonmetals tend to give up electrons.

Metalloid

Some elements in the __________ class are semiconductors.

Metal

The class of elements that are good conductors of electricity is the _______.

Metalloid

The smallest class of elements is the __________.

C) lithium

Which of the following elements is a metal? A) phosphorus B) selenium C) lithium D) boron

D) all of the above

Which statement about valence electrons is true? A) they are located in the outer energy level of an atom B) they are potentially involved in chemical reactions C) they determine whether an element can conduct electricity D) all of the above