- Macro-elements are the elements which our bodies required a lot of amount such as Oxygen, Carbon, Hydrongen ect. Micro-elements are the elemtns which our bodies need very small amount but still essential to have such as Boron, copper, silicon etc.
Q. what are the three medthods to bond two more more atomes?
- covalent, ionic and hydrogen bonds.
the strongest bond amone them is covelnt
covalent > ionic > hyderogen
Q. tructures of atom?
- atom is the smallest unit of matter that still retains the properties of an element.
More specific explanation will be with the diagram under.
5 main facts in this chapter
1. Isotopes especially radioactive isotope tries to give off particles and energy so it change into different element. We use this in many different way that we can guess the age of fossils etc.
2. Electron shell which is the average distance and energy level. When electron stays high electron shell has more potential energy. When electron absorbs energy it can move to higher electron shell and free to go back and forth by the energy level.
3. Covalent bond is the strongest because two atoms shared one or two electrons together; therefore they need to stay as close as they can.
4. Ionic bond is two different charge atoms attract each other and give off and get the electron so that they are stable and reach to the novel atom.
5. Hydrogen bond is weakest bond because it is used for the characteristic of little charged into a hydrogen atom and oxyzen so that two compound (H2O) attract each other. atom's structure
atom's structure
- An atom has neutrons, protons and electrons. The atomic number is the number of how many protons in an atom and which will be the material to determine the name of elements. Protons are positive charged and electons are negatively charged;therefore the electrons are moving around the protons (nucleus) orbital.
ten ket terms
1.Element is a substance that cannot be broken down to other substances by chemical reactions.
2. Atom is the smallest unit of matter that still retains the properties of an element
3.Compound is a substance consisting of two or more different elements combined in a fixed ratio.
4. Atomic number: the number of protons, unique to that element.
5. Potential energy is the energy that matter possesses because of its location or structure.
6. Valence electrons (outer electron): the chemical behavior of an atom depends mostly on the number of electrons in its outermost shell (valence shell).
7. Chemical bonds: the interactions usually result in atoms staying close together, held by attractions
8. Hydrogen bond forms when a hydrogen atom covalently bonded to one electronegative atom is also attracted to another electronegative atom.
9. Nonpolar covalent bond is the electrons are shared equally
10. Electronegativity is the attraction of a particular kind of atom for the electrons of a covalent bond.
chemical bonds
http://www.youtube.com/watch?v=jNWkUGE_jRE
This chapter is showing me how the life and chemical (chemistry) connected together. From the chapter 1, the level of biological organization, all the things are made of molecule and actually the group of atom is the molecule which is the smallest unit. The atom's structure and its characteristic make our life and it keeps livingthings alive.
Especially the chemical bond are also important thing because it will affect on our body and also the essential characteristic of water. Chemistry and biology are also connected each other.
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