Atomic Structure
This subatomic particle has a positive charge.
Answer: What is protons?
These are typically good conductors of heat and electricity?
Answer: What are Metals?
This number appears in front of a chemical formula and tells you how many molecules are present. Example: 3H₂O
Answer: What is the Coefficient?
This pure substance is made of only one kind of atom and is found on the periodic table
Answer: What is an Element?
This is the force that pulls positive and negative charges together. Ionic bonds form because of this force.
What is the "Electrostatic Attraction"? Ionic bonds form because of electrostatic attraction (opposites attract):
Protons (+) attract electrons (–)
Cations (+) attract anions (–)
This part of the atom contains almost all the mass, including protons and neutrons.
Answer: What is the nucleus?
This subatomic particle is found in the nucleus and has no charge.
Answer: What is a Neutron?
These usually have low melting and boiling points. If they are solids at room temperature, they are brittle and have low density. Most are held together by weak intermolecular forces, which makes them easier to melt or boil
What are nonmetals?
What does a coefficient in a chemical formula represent?
Answer: What are the number of molecules?
This substance is made of two or more different Elements chemically bonded in fixed (or specific) ratios.
Answer: What is Compounds?
Have positive and negative charges (Ions).
Answer: What are Ionic Compounds?
These elements are already stable because they have a full valence shell and are very unreactive.
Answer: What are the Nobel Gases?
This is the charge of an electron.
Answer: What is negative?
This term for elements that have properties of both metals and nonmetals?
Answer: What are Metalloids?
How many oxygen atoms are in the formula CO₂?
Answer: What are Two?
These bonds are formed from a nonmetal and a metal (transfer/taking).
Answer: What are Ionic Compounds?
This is the outermost energy level of an atom where the electrons involved in bonding are found.
What is the Valence Electron Shell?
This part of the atom contains almost all the mass, including protons and neutrons.
Answer: What is the nucleus?
What term describes atoms of the same element with different numbers of neutrons?
Answer: What is Isotopes.
These characteristics—such as melting point, density, conductivity, and reactivity—are used to identify and classify elements.
Answer: What are the properties of elements?
This tells us the number of Hydrogen atoms in the chemical formula H2O (molecule of water).
What is the subscript?
Have no charge.
Answer: What are Covalent Bonds?
This is the number of electrons most atoms want in their outer shell to become stable and unreactive.
What is 8?”
(The Octet Rule — except hydrogen and helium)
Mass, volume, density, color, and state of matter (solid, liquid, gas) are examples of this type of property.
Answer: What are Physical Properties?
An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
Answer: What is an ion?
A nonmetal takes an electron from a metal.
What is Ionic Bonds?
In the chemical formula H2O, how many hydrogen atoms are present?
What is 2?
This is the smallest unit of matter that still has the properties of an element
Answer: What is an Atom?
Elements in this group need just one more electron to fill their valence shell and become stable.
Answer: What are the Halogens?
Flammability, ability to rust, and ability to react with acids are examples of this type of property.
What are chemical properties?
Which group contains the alkali metals?
Answer: Group 1?
These bonds form between atoms by sharing.
What are Covalent Bonds?
Identify the number of oxygen atoms in the compounds CO2.
What is 2?
This forms when two or more atoms are chemically bonded together. They can be the same type of atom or different types.
Answer: What ais a Molecule?
These metals become stable by losing one electron, leaving them with a full outer shell.
Answer: “What are Group 1 alkali metals?”
This physical property describes how tightly packed matter is and is calculated using mass divided by volume.”
What is Density?
This is the name of the current Atomic Model?
Answer: What is the Electron Cloud?
These have a high melting and high boiling point?
Answer: What are Metals?
In a chemical formula, this symbol tells you to multiply everything inside it by the subscript outside.
Answer: What are parentheses?
How many magnesium, oxygen, and hydrogen atoms are in 3Mg(OH)₂? How many (total) atoms?
Answer Key:
Inside (OH)₂:
O = 1 × 2 = 2
H = 1 × 2 = 2
Multiply by 3:
Mg: 1 × 3 = (3-Answer)
O: 2 × 3 = (6-Answer)
H: 2 × 3 = (6-Answer)
Total Atoms: (15-Answer)
How many calcium, phosphorus, and oxygen atoms are in Ca₃(PO₄)₂?
Answer:
Calcium (Ca): 3
Phosphorus (P): 1 × 2 = 2
Oxygen (O): 4 × 2 = 8
This type of property describes a substance’s ability to change into a new substance with different properties.
What is a chemical property?