This term, in STEM class, I got to learn many things. We got to learn about periodic table, elements, alloy, chemical bonding, ionic bond, covalent bond, Polar and Nonpolar Covalent Bonds.
First of all we got to learn the history of Periodic table. Mendeleev is the one who organized the elements from left to right across each row, elements are arranged by increasing atomic mass. There are only 92 elements.
Now, In Periodic table, there are 118 elements, those new 26 elements were just add by some new scientist. In the modern periodic table, elements are organized by atomic number.There are 4 group in periodic table: alkali metals, alkaline earth metals, halogens and noble gases.
Group 1: Alkali Metals
All the elements in group 1 have just one valence electron, so they are highly reactive. The alkali metals are soft. Most are soft enough to cut with a knife. They are also low in density. Some of them even float on water. All are solids at room temperature. In Alkali Metals, there are lithium (Li), sodium (Na), potassium (K),rubidium (Rb), caesium (Cs), and francium (Fr).
Group 2: Alkaline earth metals
Alkaline earth metals, A group of chemical elements in the periodic table with similar properties: shiny, silvery-white, somewhat reactive at standard temperature and pressure. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
Group 3: Halogens
The halogens are five non-metallic elements. Halogen means “salt-former”. The halogens are the only periodic table group containing elements in all three familiar states of matter (solid, liquid, and gas). The halogens are a group in the periodic table consisting of five chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
Group 4: Noble gases
Noble gases are all odorless, colorless, very low chemical reactivity. The six noble gases that occur naturally are helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn)
At Halloween day, we got to make the Pixar story by using Halloween characters with elements. Here is one of my Pixar story about Lithium.
Once upon a time, there was a fat ugly witch name Bablue who live in a tiny wood house in a deep jungle. Everyday Bablue always makes the poison. One day it was a big storm rainy day. Bablue can’t make her poison because the wind blows so hard and she can’t make fire. So she told her magic broom to find something that can replace fire. After a few minutes later, her bloom came back with glass of oil with a silver rock. Then she put it in her poison. After a moment the poison was exploded and burned her hair. Because of that she turns on her computer and trying to research it. Then she saw an element name Lithium. She found out that Lithium is the chemical element with symbol Li of atomic number 3, a soft silver with the white inside like the rock that she just put into her poison at moment. It is the lightest of the alkali metals. They put them is oil because if we put them outside, it can be reacted. It’s reacted with water that why it burn her hair but if she put the just a little bit, it just boils her poison. Until finally she gets to know about it and trying to learn more about the elements.
What is alloy?
An alloy is a mixture of a metal with one or more other elements.
What is chemical bonding?
Chemical bonding, any of the interactions that account for the association of atoms into molecules, ions, crystals and other stable species that make up the familiar substances.
What is ionic bond?
Ionic bonds is the form between metals and nonmetals.
What is Covalent bond?
Covalent bonds are bonds in which atoms share rather than transfer electrons.
What is Polar Covalent Bonds?
Polar Covalent is covalent bonds, electrons are not shared equally between the two atoms.
What is Nonpolar Covalent Bonds?
Nonpolar is covalent bonds, electrons are shared equally.