Atoms
What are the 3 subatomic particles?
Protons, Neutrons and Electrons
what is the smallest part of an element called?
atom
what is in the nucleus of the atom?
protons and neutrons
what is the chemical symbol for potassium?
K
name an element on the periodic table
helium, hydrogen, etc
what charge do protons have?
positive
what charge do electrons have?
negative
what charge do neutrons have?
neutral
what is the chemical symbol for sodium?
Na
what are the 2 categories in the periodic table?
metals and non-metals
where are the electrons in the atom?
orbiting the nucleus in the shells
how many electrons can be held on every shell except the first one?
8
how many electrons can be held on the first shell?
2
what are the rows in the periodic table called?
periods
what are the columns in the periodic table called?
groups
what does the atomic number tell you?
how many protons and electrons are in the atom of the element
what 2 ways can atoms get electrons?
they can share with another atom or borrow one or more from another atom
What are valence electrons?
electrons in the outermost shell (orbital)
what is group 18 called in the periodic table?
Noble gases
what type of element is Boron?
metalloid
how can you tell when an atom is stable "happy"?
When it's outer shell is full
how do you figure out how many electrons are in an atom of the element?
atomic number as protons and electrons are the same
what is the center of an atom called?
nucleus
what group is helium in?
18 or Noble gases
Is an atom with 3 electrons stable or unstable?
Unstable