Flashcards in Chapter 2 - The Chemical Level of Organization Notes Deck (108)
the science that looks at the structure of matter.
anything that takes up space and has mass
are the smallest stable units of matter
What determines the structure of a given object or being
the way atoms combine and interact
Atoms are composed of _____ that determine the structure of an object
a unit of energy that carries a positive charge
are particles that have no electrical charge
are particles that have a negative charge
the mass of an atom is determined by the amount of protons and neutrons that are present in the nucleus
is the number of protons in an atom
Atoms normally contain _________ protons and electrons
name given to specific group of atoms
How many elements exist naturally
how many elements created in labs
elements found in body in very small amounts
elements whose atoms nuclei contain the same number of protons but a different number of neutrons
is the total number of protons plus neutrons in the nucleus used to designate particular isotopes
isotopes with nuclei that spontaneously emit subatomic particles with radiation in measurable amounts.
the emission process from radioisotopes
the time required for half of any radioactive isotope to decay
the actual mass of an atom
How is atomic weight calculated
by the number of protons and neutrons in the nucleus of the atom.
how is atomic weight expresed
Dalton aka atomic mass unit or amu
the atomic weight of an element represented in the unit of grams.
one mole of any element equals the same amount
the number that is the constant regarding moles is
It is 6.023 x 10(23) or 600 billion trillion
the rings (of electrons) that are the closest to the nucleus
are weaker charged particles, as you go further out the charge becomes greater
the outer ring or shell gives the element its
if the outer ring has room for more electrons it is considered
unstable and likely to interact with other elements that have available space for electrons
are those that have all the outer shell full of electrons and therefore cannot interact with other elements.