[ppt]period table - science - homescience4learners.weebly.com/.../0/13802145/period_table.ppt ·...
TRANSCRIPT
![Page 1: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/1.jpg)
PeriodicTable
![Page 2: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/2.jpg)
History of the Period Table• The first periodic table was
devised by Dmitri Mendeleev and published in 1869.
• Mendeleev found he could arrange the 65 elements that were then known in a grid or table so that each element had:– A higher atomic weight than the
one on its left.– Similar chemical properties to
other elements in the same column.
![Page 3: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/3.jpg)
Mendeleev‘s Table• He realized that the table lay
at the very heart of chemistry. In his table he noted gaps - spaces where elements should be but none had yet been discovered.
• Mendeleev discovered germanium, gallium and scandium for he predicted their existence and their properties before their actual discoveries.
• Although Mendeleev had made a crucial breakthrough, he made little further progress because the Rutherford-Bohr model of the atom had not yet been formulated.
![Page 4: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/4.jpg)
Mendeleev‘s Table
![Page 5: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/5.jpg)
Rutherford‘s C• Ernest Rutherford, a renowned nuclear physicist worked on
charged particles in the early 1900’s. Developed the atomic model that we used today to describe atoms.
• A. van den Broek and Henry Moseley used x-rays to study the atomic structure.
• In 1913 they used X-rays to determine the number of protons in an atom.
• He also recognized that the atomic number (number of protons) was more reliable in ordering the elements in the periodic tables.
• He arranged the new table with increasing atomic number, which allowed a more predictive quality of the periodic table than ranking them by atomic weight (mass number).
![Page 6: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/6.jpg)
Today‘s Periodic Table
![Page 7: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/7.jpg)
Atomic Number and Mass Number
• Atomic number is the number of protons in an atom.
• Mass number is the number of protons and neutrons in an atom.
![Page 8: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/8.jpg)
The structure of the Atom• Atom are made of protons, neutrons and electrons.• The nucleus contains the protons and neutrons. • Electrons orbit the nucleus.• Virtually all the mass of an atom is in the nucleus because the
electron weighs hardly anything.• Masses are measured relative to each other as the numbers are so
small (there would be 600000000000000000000000 protons in 1g)
Charge = +1
Mass = 1
Charge = 0
Mass = 1
Charge = -1
Mass = 1/1836
![Page 9: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/9.jpg)
Activity
• Use the periodic table to find the atomic numbers of the following elements;– Flourine– Hydrogen– Helium
• Explain what the mass number means.• Write down the number of protons,
neutrons and electrons in the above elements.
![Page 10: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/10.jpg)
Homework
• Create our own periodic table.• Each student has to prepare 2 A5 size
elements.Must contain:
Name
Symbol
Mass number
Atomic number
Description (2 sentences)
Can contain a picture
![Page 11: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/11.jpg)
![Page 12: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/12.jpg)
![Page 13: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/13.jpg)
The periodic tableAll the known elements are shown in the periodic table.
Can you spot any patterns in how the elements are arranged in the periodic table?
![Page 14: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/14.jpg)
Who invented the periodic table?
![Page 15: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/15.jpg)
How are the elements arranged?The elements in the periodic table are arranged in families called groups and
periods. A group is a vertical column in the periodic table; a period is a horizontal row.
For example, all the elements in group 0 are very unreactive gases at room temperature, while all the elements in group 1 are very reactive metals.
The elements in groups tend to have similar properties.
groups 0 to 7pe
riods
1 to
6
![Page 16: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/16.jpg)
Solids, liquids and gasesWhy are some symbol names in the periodic table, below, shown in different colours? (clue: think about group properties)
Bromine and mercury are liquids at room temperature; all the other elements are solids or gases.
![Page 17: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/17.jpg)
MetalloidsMetals are on the left and in the centre of the periodic table.
Non-metals are located mostly on the right.
Metalloids sometimes behave like metals and sometimes like non-metals.
Silicon and germanium are examples of metalloids.
Metalloids are located between metals and non-metals in the periodic table.
![Page 18: [PPT]Period Table - science - Homescience4learners.weebly.com/.../0/13802145/period_table.ppt · Web viewPeriodicTable Boardworks KS3 Science 2008 Atoms, Elements and the Periodic](https://reader031.vdocuments.us/reader031/viewer/2022013101/5ae074317f8b9a8f298e3672/html5/thumbnails/18.jpg)