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Atoms Essay

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Submitted By vpeng
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Pages 2
Vincent Peng
Period 1
Reflection Essay

Biography of an Atom

You are made of them, your clothes, the air you breath, and everything in the universe made of atoms. You can’t seem them individually but everything you see is made of atoms.
Atoms are the basic building blocks of matter composed of subatomic particles. Different atoms make different elements and elements create everything around you. The first atoms were discovered in 17th century and only a few were known. But by 1800 more and more different atoms had been discovered. Scientists needed a way to organize that atoms. Many attempts were made but the first successful periodic table was by Dmitri
Mendeleev in the late 1800s. The periodic table was successfully organized by their physical and chemical properties. The periodic table tells us about all the elements on earth and the makeup of the atoms.

Vincent Peng
Period 1
Reflection Essay
The periodic table is arranged in a grid. Periods are read left to right and arrange them according to atomic mass. Every element in a period had the same number electron orbitals.
Groups are arranged vertically in the table and atoms in the same group have the same number of electrons in the outer orbital. The periodic table tells you several key facts about the atom such as atomic weight, atomic number(number of protons), and name of the atom.

The periodic table is also arranged into several property groups.


Group 1: Alkali Metals



Group 2: Alkali Earth Metals



Group 3­12: Transition Metals



Group 14 or 3A: Boron Group



Group 15 or 5A: Carbon Group

Vincent Peng
Period 1
Reflection Essay


Group 16 or 6A: Nitrogen Group



Group 17 or 7A: Halogens



Group 18 or 8A: Noble Gases



Lanthanides and Actinides

For many years, the periodic table has helped countless scientists and used everyday by hundreds of people. It will continue to be one of the most crucial tools in science. The periodic table has seen many new elements added to it since its creation by Mendeleev in 1869 and will likely see more added in the future.

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