Atomic Theory
Which atom particle has NO charge
Neutron
How are atoms arranged in the modern periodic table
By increasing atomic number (also number of protons)
How many valence electrons are present in an atom of Argon?
8 (most valence electrons, stable)
When do atoms form a covalent bond?
When they SHARE electrons
Name two properties of bases
feels slippery, taste bitter, low conductivity
According to Dalton's Atomic Theory one type of an atom cannot be changed to another type by a chemical reaction
TRUE or FALSE
TRUE
Who organized elements into the MODERN periodic table?
Mendeleev
All the elements in GROUP 2 have the same ______
number of valence electrons (outer ring, 2)
If Boron, gives Carbon valence electrons, what kind of bond is this?
Ionic bonding (the transfer of valence electrons)
Which is most likely to be damaged by an acid?
a) a glass jar
b) a plastic bottle
c) an aluminum can
C) an aluminum can
List the three atom particles and their charges
Neutrons- no charge
Protons- positive charge
Electrons- negative charge
Why is it important for the periodic table have organization?
*easier to read
*similarities of elements
Why do metals have a high conductivity?
Valence electrons are free to move
Most atoms gain, lose, or share electrons to end up with how many valence electrons?
8 (stable)
Conductivity- LOW
Appearance- DULL
Malleability- LOW
Is the unknown element a metal or nonmetal?
NONMETAL
Rutherford predicted that an atom has a dense core called a ________
nucleus
There is a cloud-like area, valence electrons move freely in the given area
One property of metalloids not shared with metals or nonmetals is that they are ______ (think conductivity)
semi-conductors (in the middle)
When a molecule has slight positive and negative charges at different locations, the molecule is what?
Polar bond (unequally shared)
What are the two products of a neutralization reaction?
water & salt