1.Element:one of a class of substances that can not be seperated into simpler substances by chemical means
2.Atomic Number: the number of protons in th enucleus of an atom.
3.Energy level: one of a set of states of a physical system associated with a range of energies ( energy state)
4. Isotope: one of two or more atoms having the same atomic number but different mass numbers
what is the radioactive isotope of hydrogen used in making bombs called? - Titium is the radioctive isotope of hydrogene used in bomb making.
5.Mass number: also called atomic mass number or nucleon number; total number of protons and nuetrons (known as the nucleus)
6.compound: pure chemical substance consisting of two or more different chemical element
7. chemical bond : an attraction between atoms that allows the formation of chemical substances that contain two or more atoms. The bond is caused by the electromagnetic force attraction between opposite charges, either between electrons and nuclei, or as the result of a dipole attraction.
8.Ion: an atom or molecule where the total number of electrons is not equal to the total number of protons, giving it a net positive or negative electrical charge
9. Ionic Bond : a type of chemical bond formed by an electrostatric attraction between two oppositely charged ions
10. covalent bond : a form of chemical bonding that is characterized by the sharing of pairs of electrons between atoms; the stable balance of attractive and repulsive forces between atoms when they share electrons
11. Metallic bond : the electrostatic attractive forces between delocalized electrons, called conduction electrons, gathered in an electwon sea , and the positively charged metal ions
12.Electron shells : may be thought of as an orbit followed by electrons around an atom's nucleus
the "1" shell or "K" shell is the layer closest to the nucles and may contain up to two electrons
the "2" shell or "L" shell is the next closest layer to the center and may contain up to 8 electrons
the "3" shell or "M" shell is the third closest layer to the middle and may contain up to 32 electrons
in general each shell is labeled alphabetically (k,l,m and so on) and may contain only a cetain number of electrons given by the expression 2N^2 electrons
since electrons are electrically attracted to the nucleus, an atoms electrons will generally only occupy the outer shells if the inner shells have been completely filled by other electrons; however, this is not a requirement, and atoms may have two or three outer shells only partially filled with electrons
1.Element:one of a class of substances that can not be seperated into simpler substances by chemical means
2.Atomic Number: the number of protons in th enucleus of an atom.
3.Energy level: one of a set of states of a physical system associated with a range of energies ( energy state)
4. Isotope: one of two or more atoms having the same atomic number but different mass numbers
- what is the radioactive isotope of hydrogen used in making bombs called? - Titium is the radioctive isotope of hydrogene used in bomb making.
5.Mass number: also called atomic mass number or nucleon number; total number of protons and nuetrons (known as the nucleus)6.compound: pure chemical substance consisting of two or more different chemical element
7. chemical bond : an attraction between atoms that allows the formation of chemical substances that contain two or more atoms. The bond is caused by the electromagnetic force attraction between opposite charges, either between electrons and nuclei, or as the result of a dipole attraction.
8.Ion: an atom or molecule where the total number of electrons is not equal to the total number of protons, giving it a net positive or negative electrical charge
9. Ionic Bond : a type of chemical bond formed by an electrostatric attraction between two oppositely charged ions
10. covalent bond : a form of chemical bonding that is characterized by the sharing of pairs of electrons between atoms; the stable balance of attractive and repulsive forces between atoms when they share electrons
11. Metallic bond : the electrostatic attractive forces between delocalized electrons, called conduction electrons, gathered in an electwon sea , and the positively charged metal ions
12.Electron shells : may be thought of as an orbit followed by electrons around an atom's nucleus