2.3 Elements can combine form compounds
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What is a compound?
a substance consisting of two or more different elements combined in a fixed ratio
What are the 4 main elements in compounds?
carbon, hydrogen, oxygen, nitrogen
What is an an atom?
The smallest unit of matter that still retains properties of an element
What is a proton?
a particle with one positive electrical charge
what is an electron?
a subatomic particle with a single negative electrical charge
What is a neutron?
an electrically neautral atom
What is a nucleus?
an atom's central core
How do the electrons stay near the nucleus?
the attraction between between the - charged electrons and the + charged protons
What is the atomic number?
atoms of a particular element have the same unique number of protons
What is an atom's mass number?
the sum of the protons and neutrons in the nucleas
What is atomic mass?
equal to it's mass number, the sum of protons and neautrons
What are isotopes?
have the same numbers of protons and electrons and behave identically, but they have different numbers of neautrons
what is a radioactive isotope?
When the nucleus decays spontaneously giving off particles and energy.
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