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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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