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Name: ________________________________ Date: __________________________

Grade 9 Chemistry – Lesson 6

The Periodic Table – Part 1

*there are some long pauses in the audio of this video. Hang in there! ;)

What it Looks Like

- periodic table handout.

The History of the Periodic Table

- Early on, scientists tried to organize the elements into some groups or order but ran into several difficulties.

- They couldn’t arrange things alphabetically because every time a new one was found the whole list had to be rearranged.

- They couldn’t organize them by colour because so many looked the same.

- They could not use taste because so many were quite poisonous.

- A Russian scientist named Mendeleev found that if you arranged the elements based on their chemical properties and atomic mass, a pattern emerged.

- Mendeleev even left spots open where he knew other elements should exist because an element with certain properties of a certain mass had not been found yet.

- We are still filling in blanks of the periodic table.

- On May 30, 2012 two elements were added to the periodic table.

- We still have a few elements that have not been named yet.

What Info Can You Find in the Periodic Table?

o Atomic number (protons)

o Chemical Symbol

o Element name

o Atomic mass (protons + neutrons)

o Ion charge

- If you want to know how many protons an element has, just look at the atomic number.

- If you want to know how many electrons an element has, it is the same as the # of protons and the atomic number.

- If you want to figure out how many neutrons there are, take the atomic mass (the bigger #) and subtract the atomic number (the smaller #)

______________ - ______________ = ______________________________

How many protons, electrons and neutrons does boron have?

- ________ protons and ________ electrons

- ____________ - __________ = _________ neutrons

How many protons, electrons and neutrons does cobalt have?

- _______ protons and ________ electrons

- ____________ - __________ = _________ neutrons

Chemical Symbols

- Chemical symbols consist of one or two letters.

- The first letter is always capitalized and the second is always lower case.

CO ≠ Co

(carbon monoxide is not the same as cobalt)

- Since there are lots of elements with the same first letter, some use letters from their Latin name instead.

o Hg (mercury) hydrargyrum

o Ag (silver) argentum

o Au (gold) aurum

o Na (sodium) natrium

o Pb (lead) plumbum

o Fe (iron) ferrum

How Is It Arranged?

- Each element has an atomic number that represents the number of protons an atom of that element has.

- As you go left to right across a row, the atomic number increases by 1 for each element.

-> blank periodic table (fill in numbers ()

Name: ________________________________ Date: __________________________

Grade 9 Chemistry – Lesson 6

The Periodic Table – Part 1

*there are some long pauses in the audio of this video. Hang in there! ;)

What it Looks Like

- periodic table handout.

The History of the Periodic Table

- Early on, scientists tried to ____________________ the _____________________ into some groups or ____________________ but ran into several difficulties.

- They couldn’t arrange things _______________________________ because every time a new one was found the whole list had to be rearranged.

- They couldn’t organize them by ____________________ because so many looked the same.

- They could not use ____________________ because so many were quite poisonous.

- A Russian scientist named _________________________ found that if you arranged the elements based on their ______________________ properties and _____________ ____________, a pattern emerged.

- Mendeleev even left spots open where he knew other ____________________ should exist because an element with certain __________________________ of a certain ________________ had not been found yet.

- We are still filling in _________________ of the ________________ table.

- On May 30, 2012 two _______________________ were added to the periodic table.

- We still have a few elements that have not been ______________________ yet.

What Info Can You Find in the Periodic Table?

o ____________________ _________________ (__________________)

o Chemical _________________

o Element _________________

o Atomic ______________ (___________________ + ____________________)

o Ion charge

- If you want to know how many protons an element has, just look at the ___________________ _______________________.

- If you want to know how many ________________________________ an element has, it is the same as the # of protons and the atomic number.

- If you want to figure out how many ___________________________ there are, take the atomic mass (the bigger #) and subtract the atomic number (the smaller #)

______________ - ______________ = ______________________________

How many protons, electrons and neutrons does boron have?

- ________ protons and ________ electrons

- ____________ - __________ = _________ neutrons

How many protons, electrons and neutrons does cobalt have?

- _______ protons and ________ electrons

- ____________ - __________ = _________ neutrons

Chemical Symbols

- Chemical _____________________ consist of one or two letters.

- The ___________ letter is always capitalized and the _______________ is always lower case.

CO ≠ Co

(carbon monoxide is not the same as _____________________)

- Since there are lots of ______________________ with the same first letter, some use letters from their ______________ name instead.

o Hg (______________________) hydrargyrum

o Ag (___________________) argentum

o Au (___________________) aurum

o Na (______________________) natrium

o Pb (__________________) plumbum

o Fe (________________) ferrum

How Is It Arranged?

- Each element has an ____________________ __________________ that represents the number of protons an ____________________ of that element has.

- As you go left to right across a ___________, the atomic number increases by ______ for each element.

-> blank periodic table (fill in numbers ()

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