Which of the following is a covalently bonded molecule?
a. Cl2
b. air
c. Ne
d. MgO
What is Cl2 - chlorine gas?
100
The area around the nucleus of an atom in which the electrons travel.
What is an electron cloud?
100
What happens to electrons in the formation of a covalent bond?
What is shared electrons?
100
What is the number of the group in which the elements have a stable outer energy level?
What is Group 18?
100
How many dots are shown in the electron dot diagram for calcium, element number 20? Draw it!
What is 2?
200
Which term best describes the particles formed by ionic bonding?
a. ions
b. molecules
c. acids
d. atoms
What are ions?
200
Electron dot diagrams are used to represent _______.
What is valence electrons?
200
What is the maximum number of electrons in the "second" energy level?
What is 8 electrons?
200
Potassium belongs to the Group 1 family of elements on the periodic table. What is the name of this group?
What is alikali metals?
200
Sulfur, element 16, forms a negative ion. How many dots would you have to show in the electron dot diagram for the sulfur ion?
What is six? Draw it!
300
Which of the following compounds is unlikely to contain ionic bonds?
a. NaF
b. CO
c. LiCl
d. MgBr
What is CO - carbon dioxide?
300
A positively "charged" particle is called a __________.
What is a cation?
300
A negatively "charged" particle...
What is an anion?
300
In the compound H2O, the electrons are ________(transferred/shared) therefore forming a(n) __________ (ionic/ covalent)bond.
What is shared and covalent?
300
Draw the bond for Fluorine gas.
What is F2 covalently bonded?
400
What type of bond connects the atoms in a molecule of nitrogen gas (N2)?
What is covalent?
400
A ___________ forms when two or more atoms "share" electrons.
What is a covalent bond?
400
The rows of the periodic table are called ___________ and represent the number of ___________.
What is period and what is an energy level?
400
How many valence electrons does Phosphorus have?
What is 5?
400
What is the purpose of a dot diagram?
It shows the elements symbol and how many valence electrons the element has.
500
Explain metallic bonding. Name two characteristics common for metals.
What is chemical bonding between metals? What is they are good conductors of electricity and they are malleable and ductile---common properties of metals.
500
A _________ is the force that holds two atoms together.
What is a chemical bond?
500
A helium atom has only two electrons. Why does helium behave as a noble gas?
Because it has two electrons in its outer shell. It only has one outer shell so it is considered full with two. Full shells are the most stable.
500
What does the element's column tell you about the element?
The column tells you how many valence electrons the atom has. (notice the pattern...Gp 1 has 1 valence electron: Gp 13 has 3 valence electrons)
500
Why are only the valence electrons shown in a dot diagram?
They show how the element can "react" with other elements.