Levels Of Chemical Organization Flashcards
Atom
Is the functional unit of an element. It consists of the nucleus, which contains protons, neurons, and surrounding elements
Molecules
Two or more atoms are joined to form and element for example ——O2
Element
Is a substance composed of only one type of atom that cannot be broken into simpler ingredients by chemical means
Example : oxygen, hydrogen
Compound
Is a chemical combination of two or more elements
For example: NaCI
How can an atom be characterized
By its atomic number, symbol and atomic weight
The number of protons and neutrons combined is the atoms..
Atomic number
The number of protons and neutrons combined is the atoms..
Atomic mass
All atoms of an element have the same number of protons and electrons but some atoms may have different number of neutrons
Fact about atoms
All isotopes of an element have the same chemical proper because they have the same number of protons and electrons
Fact about all isotopes
Electrons don’t stay still. They keep farting about within certain limits called orbitals
Orbitals
Orbitals are arranged into..
Energy levels(shells) depending on their distance from the nucleus
The farther and orbital extends from the nucleus the higher its energy level is.
The energy level closest to the nucleus has one orbital, so it can hold two electrons.
The next energy level has up to four orbital, so it can hold eight electrons.
Behavior of a chemical bonding
The number of electrons in the outer energy level of an atom determines how it behaves chemically( that is how it may unite with other atoms)
Note
Orbitals are arranged into energy levels
Energy levels
Regions surrounding atomic nucleus that contain electrons
