2. atom
1. The basic building block of matter.
2. The smallest component of an element having the
chemical properties of the element.
3. chemical formula
noun A chemical formula or molecular formula is a
way of expressing information about the atoms that
constitute a particular chemical compound. ex.
Al2(SO4)3
5. electron
noun particle in an atom that has a negative
electrical charge
6. element
noun A substance whose atoms are all alike. There
are over 100 elements on the Periodic Table.
7. gas
noun,verb One of the three states of matter. This
state of matter has no fixed shape and no fixed
volume.
8. heterogeneous
adjective These types of mixtures contain more than
one substance evenly mixed but not chemically
bonded together and is the same throughout.
9. homogeneous
adjective When two or more substacnes come
together but don't chemically combine or bond to
make a new substance it is called this.
14. molecule
noun The smallest physical unit of a substance that
can exist independently, consisting of one or more
atoms held together by chemical forces.
15. neutron
noun An elementary particle with 0 charge and mass
about equal to a proton; enters into the structure of
the atomic nucleus.
16. nucleus
1. The positively charged center of an atom.
2. The nucleus is in the center of the atom