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.

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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 ◦ 1 st shell = 2 electrons ◦ 2 nd shell = 8 electrons ◦ 3 rd shell = 18 electrons ◦ 4 th 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