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Elements & Atoms
Atoms, Bonding & the Periodic Table
Ionic Bonds
Covalent Bonds
Potpourri
100
These are the simplest pure substances that cannot be broken down into any other substances.
What are elements?
100
The force of attraction that holds atoms together as a result of the rearrangement of electrons between them.
What is chemical bond?
100
This occurs when an atom loses an electron.
What is it becomes a positive ion?
100
This type of chemical bond is formed when two atoms share electrons.
What is a covalent bond?
100
When an atom gains a valence electron, it becomes a _______ ion.
What is negative?
200
This is the smallest particle of an element.
What is an atom?
200
Each group or family in the periodic table has its own characteristic properties based on the number of these.
What are valence electrons?
200
An ionic bond is formed by this.
What is the attraction between oppositely charges ions?
200
This is formed when two pairs of electrons are shared between two atoms.
What is a double bond?
200
Because the force of attraction between the positive and negative ions is so strong, ionic compounds have _________ melting points.
What is high?
300
These particles of an atom are foung in the nucleus.
What are the protons and neutrons?
300
This is the greatest number of valence electrons an atom can have.
What is 8?
300
Ions that are made of more than one atom are examples of these.
What are polyatomic ions?
300
This is the reason that molecular compounds do not conduct electricity.
What is they do not break up into ions or charged particles?
300
The number of _________ __________ in an atom of an element determines its chemical properties.
What is Valence Electrons?
400
This English chemist proposed an atomic theory that states all elements are composed of atoms that cannot be divided.
Who is John Dalton?
400
The atomic number of an element indicates the number of these two sub-atomic particles it contains.
What are the number of protons and electrons?
400
These are characteristic properties of ionic compounds.
What are they have crystal structures, high melting points, and electrical conductivity?
400
This type of covalent bond is formed when electrons are shared unequally.
What is a polar bond?
400
What is the chemical name for the compound with the formula Na2S?
What is sodium sulfide?
500
In Ernest Rutherford’s gold foil experiment, most positively charged particles passed through the foil, but a few particles were deflected strongly. This result caused Rutherford to infer this about atoms.
What is that an atom’s positive charge must be clustered in a tiny region in its center, called the nucleus.
500
You would need this many atoms of a Group 17 element to react with one atom of a Group 2 element.
What are two?
500
Ionic compounds are electrically....
What is neutral?
500
These properties would help you to identify a molecular compound.
What are low melting and boiling points, and they are poor conductors of electricity?
500
List three elements from the group containing the most reactive nonmetals.
What are: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), or astatine (At)?