Time is now up for the Do Now! Six minute(s) for Do Now Five 33. How do we read the Periodic Table? HW or study 11/12 DN 32 DN30 CW 30 DN 31 CW 31 A Day For a great stamp: complete, silent, and seated in assigned chair. Four Three Two One Remember to set up your notebook when done.

Time is now up for the Do Now! Six minute(s) for Do Now Five 33. How do we read the Periodic Table? HW or study 11/12 DN 31 DN 32DN30 CW 32 CWDN 33 CW 33 CW 31 B Day For a great stamp: complete, silent, and seated in assigned chair. Four Three Two One Remember to set up your notebook when done.

Agenda Do now review Mastery competition update Vocab review: stand up, hands up, pair up Video: challenge question! Guided notes: elements on the Periodic Table Practice worksheet Exit check

The Do Now. Let’s review.

Mastery competition update: D31 exempt

By the end of class… Determine the number of protons and neutrons in an element from the P.T. Use the P.T. to predict the ionization of various elements (like last time) Key vocab: – Isotopes – Mass number – Atomic number – Chemical symbol – Atomic mass CAUTION!

Vocab review: stand up, hands up, pair up 1.Each person receives a vocab flashcard and becomes an expert on that word 2.You stand up and raise your hand, looking for an available partner with a hand up 3.Walk over and high five 4.Quiz each other on your words 5.Trade cards and find new partner You should exchange cards at least 10 times in 7 minutes.

Video: challenge question The video tells us about the history of the periodic table. While you watch, figure out: 1.The name of the Periodic Table’s creator 2.A new row, or period, starts on the Table when _______________ repeat. MissionBuck question: what happens in the Bohr Model when it resets to the new period?

For guided notes, turn to the back of the Do Now!

Reading the Periodic Table Groups Vertical columns Periods Horizontal rows

What is an element? Elements are types of atoms. We classify atoms into elements by their number of a Therefore, all atoms of the same element will have the same number of protons. protons.

How can atoms of one element vary? But the number of neutrons can vary. Two atoms of the same element with different numbers of neutrons are called isotopes.

How can atoms of one element vary? Both of these Bohr models have 9 protons and are therefore fluorine. But they are different number of neutrons and are therefore different isotopes.

How can atoms of one element vary? Two different isotopes. The mass number is the total number of protons plus the total number of neutrons in an isotope. 13 F 19 F

How can atoms of one element vary? Two different isotopes. MissionBuck question: where can we find mass numbers for different isotopes in the classroom? 13 F 19 F

Reading an element’s square Atomic number Tells us the number of protons in an element (same as the total starting number of electrons) Atomic mass The number of protons plus the (weighted) average number of neutrons in an atom of this element Chemical symbol Name of the element

Two words of caution 1.It may be easy to confuse the atomic mass and the mass number. The mass number is the number of protons and the number of neutrons for any isotope of an element; the atomic mass is the average across all isotopes. 2.In a standard Bohr model atom, the number of protons and electrons is the same and the total charge is zero/neutral. The number of valence electrons, however, is different, and atoms will gain or lose these because they want full valence levels.

Let’s practice!

Independent practice. In seven minutes, complete at least five rows on the back of the Do Now individually. If you have questions, first ask a member of your element group. Only ask Mr. Linehan if neither of you knows.

Exit check