Quarter 1

Atom
A (an) is the basic unit of matter.
Neutron
Particle in the nucleus of an atom that has zero charge.
Electron
Particle in the nucleus of an atom that has a negative charge.
Proton
Particle in the nucleus of an atom that has positive charge.
Protons + Neutrons
The mass number of an individual isotope.
Atomic Number
The number of protons in an element is also the ___________ ______ of the element.
The electromagnetic
The __________ force holds the
electron(s)in the atom.
Radioactivity
the spontaneous decay of an atom into another isotope of the same or different element.
Alpha and Beta particle and Gamma radiation
The three types of radioactive decay.
Chemistry
The central science, the study of matter.
The proton
An atom’s identity comes from which subatomic particle?
Dmitri Mendeleev
The first periodic table was developed by…
The outmost electrons
Valence electrons are…
Hypothesis
In the scientific method, an investigation uses methods of control to test a(an) …
Physical
Is density a chemical of physical property of matter?
Chemical
Baking cookies is a __________change.
Physical
Breaking glass is a __________change.
Conclusion
What is the last step of the scientific method?
D = m / V
The formula for density
Sublimation
What is the phase change called from solid to gas?
Mass cannot be created or destroyed
What is the Law of Conservation of Mass?
Solid, liquid, gas, and plasma
What are the four states of matter?
Periodic Table
Organized table of elements by atomic number.
Isotope
Elements with the same number of protons but different numbers of neutrons
Half-life
The decay rate used for radioactive substances
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