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Periodic Table
Term | Definition |
---|---|
Matter | everything that has mass and takes up space. |
Mass | The material matter is made of |
Volume | how much room matter takes up |
Density | ratio of the mass of a substance to its volume |
atom | the smallest unit of a chemical element having the properties of that element |
electron | elementary particle carrying a unit charge of negative electricity |
proton | elementary particle having a single positive electrical charge |
neutron | uncharged elementary particle of slightly greater mass than the proton |
periodic table | large grid that classifies all the elements by their chemical and physical propeties |
rows/periods | rows that tell you how many energy levels each element has |
groups/columns | the number of electrons in the outer shell |
valence electrons | the electrons that move on the outer shell of an atom |
atomic number | the number of protons inside the nucleus |
atomic mass | the measurement of mass for an element |
chemical property | the ability of substances to combine and form new compounds |
physical property | the state of matter and appearance of a substance |
ionic bond | when elements lose or gain an electron suring bonding |
covalent bond | elements share electrons during bonding |
chemical change | elements bond together through the attractive force of the electrons |
compound | two or more elements combine in a specific ratio |
mixture | when two or more substances combine but do not make a new substance |
nobel gases | all the elements in group number eighteen |
halogen | all the elements in group number seventeen |
alkali | all the elements in group number one |
metalloids | elements found along the step like line between metals and non-metals of the periodic table. |