Atoms
The charge of a proton.
Positive
can be hammered into thin sheets
malleable
simplest form of a pure substance
element
what does the atomic number tell about an element
the number of protons
no new substances are created
physical change
The charge of an electron
Negative
can be drawn into a thin wire
ductile
the building blocks of all matter
atoms
hydrogen is a _________ at room temperature
gas
a new substance with new properties is created
chemical change
The charge of a neutron
neutral or no charge
allows energy to flow through
conductor
two or more types of atoms bonded together
compound
How should a chemical symbol be written?
one letter: capital
second letter: lower case
gas production, temperature change, and precipitate are examples that a ___________ change has happened
chemical
The location of electrons in energy levels
electron cloud
absorbs light and is reflected as shine
luster
smallest unit of a compound
molecule
Electrons = __________
protons
the kind of reaction that absorbs energy
endothermic
the inner most part of an atom where protons and neutrons are found
nucleus
easily broken
brittle
NaCl is an example of a ___________
compound
How is the periodic table read?
Left to right (like a book)
the kind of reaction that gives off energy
exothermic