ATOMIC CONCEPT
SEPTEMBER 17, 2015
DO NOW – 9/17/2015
In your Notebook, write today date
 Answer the following questions in the
Notebook:
◦ Q1: Which period does Hydrogen belong
to?
◦ Q2: Which group does element He belong
to?
◦ Q3: Looking at the periodic table, how
can you determine how many protons is
associated with element Nitrogen?

 Paste
the Regent Facts to the next
available page
HOMEWORK

Study for QUIZ 2
THIS WEEK
QUIZ 2 – FRIDAY
 NOTEBOOK CHECK – Friday (I will pick
up at the end of class)

◦ Make sure your cover page includes: Full
Name, Chemistry and Class Period
◦ Make sure notebook is up to date
AIM

Does the number of neutrons always
equal to the number of protons for an
element?
REGENT FACTS

2. Each atom is made of a positively
charged nucleus with one or more
orbiting, negatively charged electrons.

3. Subatomic particles found in the
nucleus include protons and neutrons.

4. Protons have a positive charge,
neutrons no charge, and electrons a
negative charge.
REGENT FACTS
 5. Protons
and electrons have
the same magnitude but
opposite charges.
◦ In an atom, the number of protons
equals the number of electrons
◦ Positively-charged protons
cancelled negatively-charged
electrons to form a neutral atom.
REGENT FACTS
 6. The
mass of a proton or
neutron is 1 amu (1 u). The
mass of an electron is almost
0 amu.
◦ The atomic mass of an atom is
equal to the total number of
protons and neutrons.
REGENT FACTS

11. Atoms of the same element all
contain the same number of
protons.
◦ Changing the number of protons changes the
atom into a different element.
◦ The atomic number is the number of protons
in an atom of an element.
REGENT FACTS

12. Number of electrons in
completely filled electron shells (for
the first 4 shells). Electron shells are
also known as energy levels
◦
◦
◦
◦
1st shell = 2 electrons
2nd shell = 8 electrons
3rd shell = 18 electrons
4th shell = 32 electrons
GUIDED PRACTICE
Take out the puzzle from the in-class
folder
 Across 2: the number of protons always
_____________ to the number of
electrons

◦ Which word from the word banks will
complete the statement?

Fill in the puzzle
INDEPENDENT PRACTICE
YOU WILL BE GIVEN 10 MINUTES TO
COMPLETE THE PUZZLE.
 AFTER THAT WE WILL EXCHANGE
THE PAPER AND GRADE THEM IN
CLASS.
 NOTE: Across 11 answer is chemical

SUMMARY TO TODAY LESSON
HOMEWORK REMINDER
Extra credit: box of kleenex/tissue (5
points toward UNIT TEST1)
 Study for QUIZ 2
 Notebook check tomorrow
