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BEMS-ScienceChem
Question | Answer |
---|---|
Small particle that is the building block of all matter | Atom |
Substance that consists of only one type of atom | Element |
Positively charged particle in the nucleus of the atom | Proton |
Neutrally charged particle in the nucleus of the atom | Neutron |
Negatively charged particle that occupies the space in an atom outside the nucleus | Electron |
An atom that is no longer neutral because it has lost or gained valence electrons | Ions |
Atoms of the same element that have different numbers of neutrons | Isotope |
Substance containing atoms of two or more different elements chemically bonded together | Compound |
Made of 2 parts - A solvent and one ore more solutes | Solution |
Matter with a composition that is always the same | Substance |
2 or more atoms that are held together by covalent bonds and act as a unit | Molecule |
Matter that can vary in composition | Mixture |
Mixture in which 2 ore more substances are evenly mixed by not bonded together | Homogenous mixture |
Mixture in which substances are not evenly mixed | Heterogeneous mixture |
a chart of the element arrangements into rows and columns according to their physical and chemical properties | Periodic |
Approximately how many elements are metals? | 3/4 |
Approximately how many elements are metalloids? | 1/8 |
Approximately how many elements are non-metals? | 1/8 |
When Mendeleev developed the first periodic table, how many elements were known? | 60 |
How are elements organized on the modern periodic table? | Columns - rows and blocks basec on certain patterns of properties |
A column on the periodic table having the same chemical properties and react in similar ways | Group or family |
Rows on table - atomic number increases left to right | Period |
Where is Alkali found on the periodic table? | Column 1 |
Where is Alkaline on the periodic table? | Column 2 |
Where is Halogens on the periodic table? | Column 17 |
Where are Noble Gases on the periodic table? | Column 18 |
Where are transition elements found on the periodic table? | Columns 3-12 |
Name some properties of Metals? | Shiny - Easily pulled into wire or hammered into sheets - Good conductor of electricity and thermal energy |
What are some properties of Non Metals? | Has no metallic properties - Bad conductor of electricity and thermal energy |
What are some properties of Metalloids? | Like metals and non metal physically and chemically - Semiconductor of electricity - in high temps it acts like metal - in low temps it acts as non metal |
Hydrogen symbol | H |
Lithium symbol | Li |
Beryllium symbol | Be |
Sodium symbol | Na |
Magnesium symbol | Mg |
Potassium symbol | K |
Calcium symbol | Ca |
Iron symbol | Fe |
Nickel symbol | Ni |
Copper symbol | Cu |
Silver symbol | Ag |
Gold symbol | Au |
Zinc symbol | Zn |
Mercury symbol | Hg |
Boron symbol | B |
Carbon symbol | C |
Aluminum symbol | Al |
Silicon symbol | Si |
Tin symbol | Sn |
Lead symbol | Pb |
Nitrogen symbol | N |
Phosphorous symbol | P |
Oxygen symbol | O |
Fluorine symbol | F |
Sulfur symbol | S |
Chlorine symbol | Cl |
Argon symbol | Ar |
Neon symbol | Ne |
Helium symbol | He |
Iodine symbol | I |