AtomsAtoms are the very small substances (building blocks) of all matter. The nucleus is the central part of the and contains most of its mass . An atom has three main parts.
Proton is located in the nucleus and it has a positive charge.
Neutron is also located in the nucleus and it has a nuetral charge or no charge at all.
Electon is located outside the nucleus and has a negative charge.
Metals, Nonmetals, and Metalloids
Metals: shiny, can be bent or pulled, good conducters of heat/ electricity; many are solids at room temperature.
Nonmetals: dull, brittle, poor conductors ofheat/ electricity ; many are gases at room temperature.
Metalloids: conduts electricity under some conditions
Periodic Table
Chemical Symbol: element's abbreviation: first letter is capitalized and second letter ( if has one) is lowercase.
Examples:N for Nitrogen, O for Oxygen, Au for gold
Chemical Formula:substance's abbreviation
Subscript:number at the lower right of the element's symbol (shows number of atoms;) if no subscript, there is 1 atom.
Example:H2O hass 2 Hydrogen atoms and 1 oxygen atom
Periodic Table:chart of elements, arranged in rows in increasing atomic number (the number of protons in the element); elements in the same column (group) are similar.
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