Transcript Target: (#14) 1. Convert 14 km to meters 2. Convert 455 ml

Warm-Up:
1. Convert 14 km to meters
2. Convert 455 ml to liters
Practice:
1. 1285 ml to L
2. 19.78 km to m
3. 89234 m to km
4. .00564 km to m
5. 190 cm to m
6. 2423.232 mm to m
7. 1800 g to kg
8. 5343 hg to g
9. 4.545 L to ml
10. 2 days to seconds
Notes:
Matter
Matter is anything that has
mass and takes up space.
An atom is the smallest particle
into which an element can be
divided and still be the same
substance.
Targets 8/13/14
1.Name the three components of an
atom
2.Name the charges of those parts of an
atom.
3.Finish this statement: Opposites
_____________.
An atom is made up of three basic
items:
Protons (+) are in the nucleus
Neutrons (neutral) are in the nucleus
Electrons (-) are floating around in a
cloud
What is Matter? QuickWhat is
Matter?Time
An atom gets its atomic number from
how many protons it has.
Ex. If gold (Au) has an atomic
number of 79, it has 79 protons.
Which came first? Gold was given the Atomic Number of 79 after scientists
discovered that it had 79 protons in its nucleus.
If you lined up 70 million
atoms, they would stretch
across your pencil eraser.
A piece of paper is 1 million
atoms thick.
An atom’s nucleus is its
center.
The nucleus contains
protons and neutrons
The atomic mass of an atom is
calculated by adding the number of
protons and neutrons in the nucleus.
The atom is mostly empty space.
Think of a baseball inside of Turner
Field.
The number of protons
determines the element’s
identity
Protons have a positive charge
Neutrons have no charge (neutral)
Therefore, the nucleus has a positive
charge overall.
Number of protons
= Atomic Number
Electrons are negatively
charged particles in the
electron cloud
Isotopes have different
numbers of neutrons in the
nucleus
Electrons “orbit” in electron
shells
Energy Level # of electrons
1
2
2
8
3
18
4
32
The number of the period
(row) an element is in, is the
same as the number of
shells it has
The first shell needs to be full
before the second shell gets any
electrons.
The last, or outer, shell is called the
VALENCE SHELL.
The electrons in the valence shell
are called valence electrons
The number of valence
electrons determines
reactivity
Molecules are made of
multiple atoms chemically
joined (bonded) together.
A covalent bond happens
when atoms share electrons
When atoms join to form
molecules, they create a
new substance with unique
properties
The new substance is a
compound
Sugar: C12H22O11
Ammonia: NH4
Warm-Up:
1. When atoms chemically bond
together, they create a ______.
2. Atomic Number = # of ______ in
the nucleus of an atom.
3. Draw a nitrogen atom (with
shells)
Warm-Up:
1. __________ is made of particles
that have volume and mass.
2. Draw an oxygen atom.
3. How many valence electrons
does oxygen have?