2.1 The Nature of Matter Study Guide

basic units of matter

1,000,000 atoms=
1 centimeter

components of an atom
protons, neutrons, and electrons

positive charge
located in the nucleus
relatively big

negative charge
Located around the nucleus
Relatively small (tiny!)
Fill levels around the nucleus (2-8-8 pattern)

neutral charge
Located in nucleus
Relatively big

are pure substances made of only one type of atom

periodic table
Organized collection of all known elements

element symbol
letter(s) assigned to represent the element

atomic number
number of protons in the atom

atomic mass
the average mass of all atoms of that type (calculated by rounding neutrons + protons)

are unstable and they breakdown over time

are substances formed by atoms of two or more elements joined together by chemical bonds.

Compounds can be expressed with formulas
(H2O, CO2)

Ionic bonds
One or more electron is transferred from one atom to the next

Ionic bonds Results in

are atoms that have gained or lost electrons, so they carry a charge

Covalent bonds
One or more electrons are shared by two atoms

Both atoms share at least
one of their electrons with the other

when atoms are joined by covalent bonds they form
molecules (may be the same element)

covalent bonds are stronger than ionic bonds because of

Tagged In :

Get help with your homework

Haven't found the Essay You Want? Get your custom essay sample For Only $13.90/page

Sarah from studyhippoHi there, would you like to get such a paper? How about receiving a customized one?

Check it out