chemistry unit 2 Flashcards
(16 cards)
what are all substances made of
atoms
what is an atom
the smallest unit of matter that can exist on its own
where are the different types of atoms listed
the periodic table
what are the horizontal rows on the periodic table called
periods
what are the vertical columns called on the periodic table
groups
what are subatomic particles
the particles that make up and tom
what are the proton and the neutron called together
nucleus
what subatomic atom has a positive charge
proton
what subatomic atom has a negative charge
electrons
what subatomic atom have no charge
neutrons
where are the electrons found in an atom
the shells
what is an atoms atomic number
the number of protons in an atom
why is the atomic number not the number of electrons
it is fundamentally the number of protons in the nucleus
how many electrons does an atom have
the same number of protons
what is an atoms atomic mass
the number of protons and neutrons put together
what is a molecule
a small number of atoms joined together
