Atoms and Elements
(LT 1-4)
Essential Question- What is everything in the
universe made of?
What do you
remember?
Copying this
slide is
optional
The periodic table shows approximately
120 known elements.
Elements can be classified as metals,
nonmetals, and metalloids.
When two or more elements combine,
they form a compound.
Everything in the universe is made of
elements which are made of atoms.
Remember : Cornell Style Notes; On as many right hand pages as you need
What are the elements made of?
Element - the simplest pure substance
Elements are made of atoms, and each element’s
atoms are unique to that element.
(ex: the element gold is made of gold atoms, the
element oxygen is made of oxygen atoms, etc.)
Atoms - the basic building blocks of all matter. They
are the smallest part of an element that keeps that
elements properties.
3 Subatomic particles : protons, neutrons, electrons
What are the parts of an atom?
(LT 1)
1. Nucleus –the small dense
center of atom composed of
protons and neutrons; this is
where most of the atoms
mass is located. (mass
number if rounded. Atomic
mass if not rounded)
2. Electron Cloud/Energy
Levels – regions around the
nucleus of an atom where
electrons are located; mostly
empty space
Draw this image to help you remember.
What are subatomic particles?
(LT 2,3,4)
a. Protons – positively
charged particles inside
the nucleus (center).
b. Neutrons – neutral
particles (have no
charge)inside the nucleus.
c. Electrons – negatively
charged particles found in
the electron cloud outside
of the nucleus.
Nucleus:
protons +Neutrons
= mass number
Draw and label the atom
above to help you
remember. Make it large
and neat.
What is the mass of an atom?
Atomic Mass Unit – (amu): Unit of measurement for the mass of subatomic
particles.
1 amu = 1.7 X 10-24 g - They are TINY!!! (0.000000000000000000000017 grams)
1. Proton = 1 amu
2. Neutron = 1 amu
3. Electron = almost zero (TINIEST particle
with the least mass)
Most mass is in the nucleus with protons and neutrons
*Otherwise atoms are mostly EMPTY SPACE
1.
The atomic mass of an atom is the mass of the protons & neutrons added
together.
2.
When we round that number, it is called the mass number.
Costa Questions and
Summary
Develop a Costa Question from your
notes for each level.
The 5-7 Sentence summary goes at the
bottom of the page. It must answer the
essential questions and describe each
concept. Underline all of the vocabulary
words in your summary.