9.30.W - Lesson Review: PT: Metalloids & Halogens / PT: Nonmetals & Noble Gases / Want to Know More About the Elements?

Metalloids are the smallest class of elements, containing just _______ elements.

6

All of the noble gases have ____________ electrons in their outer shell.

8

___________ strengthens teeth and bones.

Calcium

___________ are elements between metals and nonmetals because they have properties of both.

Metalloids

_______ is essential to building amino acids.

Nitrogen

What can you conclude about the classification of silicon?

Silicon is a metalloid and has properties of both metals and nonmetals - it appears lustrous, but is brittle and a poor conductor of heat and electricity.

Unlike metals, nonmetals exhibit high ______ and fractures easily when subjected to stress.

brittleness

The period that an element is in tells the number of ________ shells normally possessed by an atom.

electron

What is the element that is a part of the nonmetals classification but is not organized to be around it in the Periodic table?

hydrogen

Ferrous metals contain an important element from which the Latin word for ferrous comes from is _______.

iron

Noble gases are the ____________________.

least reactive of all elements

What is an optional element that can be placed in tires besides oxygen that offers some benefits such as the tires lasting longer?

nitrogen

Neon is an example of a _______________.

noble gas

Helium, neon, and argon are examples of

noble gases.

The necessary element that forms part of the structure of DNA and RNA is ___________ .

phosphorus

Halogens are _______ conductors and have __________ melting and boiling points.

poor; low

Groups in the periodic table have the same number of electrons in the outermost ________ of an atom.

shell

Any alloy of iron mixed with a small amount of carbon to increase its strength or malleability is called ________________.

steel

Match the following elements with their best descriptions:

strengthens teeth and bones calcium essential to building amino acids nitrogen essential to respiration which is the process that gives your cells energy oxygen forms part of the structure of DNA and RNA phosphorus