| A | B |
|---|
| Symbol | Used to represent an element |
| Compound | 2 or more elements chemically combined in a definite ratio to make a new substance |
| Molecular or Chemical Formula | Used to represent a molecule/compound |
| Molecule | Smallest part of a compound |
| Proton | Subatomic particle in the nucleus with a positive charge |
| Neutron | Subatomic particle in the nucleus without a charge |
| Electron | Subatomic particle in the outer energy levels with a negative charge which determines how atoms bond |
| Atomic Number | Number of protons in the nucleus of an atom |
| Mass Number | Number of protons plus the number of neutrons in the nucleus of an atom |
| Maximum number of electrons in the third energy level | 18 |
| Maximum number of electrons in the second energy level | 8 |
| Maximum number of electrons in the first energy level | 2 |
| Maximum number of electrons in the fourth energy level | 32 |
| Dmitri Mendeleev | Chemist who arranged the first periodic table. |
| Henry Moseley | Scientist who set up the modern periodic table. |
| Group or Family | Name given to columns on a periodic table/Elements share similar properties |
| Period | Name given to rows on the periodic table |
| Valence Electrons | Number of electrons in the outermost energy level of an atom |
| Metals | Physical characteristics are luster, good conductor of heat and electricity, high density & melting point, ductile, and malleable |
| Metals | Chemical properties include: lose electrons easily and corrosive |
| Nonmetals | Physical properties are dull, poor conductors of heat and electricity, low density and melting point, brittle and breaks easily |
| Nonmetals | Chemical property is that they tend to gain electrons easily |
| Metalloids | Elements along the zigzag line, which share properties of both metals and nonmetals |
| Zig Zag Line on Periodic Table | Separates metals and nonmetals, metals to the left and nonmetals to the right |
| Round the atomic mass to the nearest whole number | How can you calculate mass number from the atomic mass? |
| Element with similar properties to Magnesium | Strontium (Sr) |
| Metalloid with 32 electrons | Germanium (Ge) |
| Eight | Wtoms are stable when either their outermost energy level is full or they have how many valence electrons? |
| Atomic Mass | The first periodic table was arranged by increasing what? |
| Atomic Number | Today's modern periodic table is arranged by increasing what? |
| Oxygen | Nonmetal in group 16 |
| Hydrogen | Nonmetal found on the metal side of the table |
| Aluminum | Metal that is on the line that should designate it as a metalloid |
| Helium | Noble gas that doesn't have eight valence electrons. |
| Electrons | In a neutral, uncharged atoms, the protons equal what other subatomic particle? |
| Three | Number of valence electrons in Gallium (Ga) |
| Ductile | A property which means can be drawn into wires. |
| Malleable | A property which means can be hammered into thin sheets. |
| Astantine (At) | Heaviest element with 7 valence electrons |
| Neutrons | Type of particle which is calculated by subtracting the number of protons from the mass number |
| Ba | Symbol of the element in group 2 and period 6 |
