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science test #2
chemistry
Question | Answer |
---|---|
Element | made of one kind of atom. It can't be broken down during a chemical reaction. It combines with other elements to form compounds. |
Symbol | the abbreviation for the element. Always a capital letter, or a capital and a lower case. |
Atomic mass | decimal number below the symbol. It is the mass of the protons and neutrons in an element |
Atomic number | located above the symbol Tells the number of protons in the nucleus of an atom. |
Period | vertical column of elements on the periodic tables. These element have similar properties. |
Mass number | number of protons and neutrons in the nucleus of an atom. It is the atomic mass rounded to the nearest whole number |
To determine the number of protons. | look at the atomic number |
To determine the number of electrons. | same as the number of protons |
To determine the number of neutrons | take the atomic mass, and round to the nearest whole number . This gives you the mass number. Take the mass number and subtract the atomic number. |
Carbon | C |
Fluorine | F |
Sodium | Na |
Magnesium | Mg |
Silicon | Si |
Phosphorus | P |
Sulfur | S |
Potassium | K |
Calcium | Ca |
Titanium | Ti |
Iron | Fe |
Copper | Cu |
Silver | Ag |
Tin | Sn |
Xenon | Xe |
Platinum | Pt |
Gold | Au |
Lead | Pb |
Plutonium | Pu |