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chemistry
chemistry stack
Question | Answer |
---|---|
Metals | usually shiny and can be formed into shapes (malleable). They are good conductors of electricity. |
Nonmetals | most have the properties opposite of metals. Nonmetals are dull and cannot be shaped. |
Semimetals | have some properties of both metals and nonmetals.Some semimetals are shiny but cannot be shaped. |
Noble Gases | elements that do not combine easily with other elements. |
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. |
Group | vertical column of elements on the periodic tables. These element have similar properties. |
Period | elements in a horizontal line on the periodic table. These elements all have the same number of electron levels (valence) |
Mass number | number of protons and neutrons in the nucleus of an atom. It is the atomic mass rounded to the nearest whole number |
Protons | look at the atomic number |
Electrons | same as the number of protons |
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. |
chemistry | The study of composition and properties of matter and how substances react with each other. |
physical properties | color,density, state of matter at room temperature, texture, odor,shape. |
volume | unit that measures volume or cc. |
displacement | a method of determining the volume of an irregular object by measuring. |
Density | the amount of matter in a space. |
if something flots it is buoyant or has buoyancy |