periodic table (n.), A chart that organizes all chemical elements according to their atomic numbers and properties., chemical element (n.), A pure substance made of only one type of atom., atomic number (n.), The number of protons in the nucleus of an atom., atomic mass (n.), The average mass of an element's atoms., atomic mass unit (n.), A unit used to measure the mass of atoms and molecules., chemical symbol (n.), A short abbreviation used to represent an element., electron shell (n.), A region around the nucleus where electrons are found., electron configuration (n.), The arrangement of electrons in an atom., valence electron (n.), An electron in the outermost shell of an atom., period (n.), A horizontal row in the periodic table., group (n.), A vertical column in the periodic table., block (n.), A section of the periodic table based on electron configurations., metal (n.), An element that usually conducts heat and electricity well., non-metal (n.), An element that does not have typical metallic properties., noble gas (n.), A group of gases with very stable electron arrangements., nuclear charge (n.), The positive charge of an atom's nucleus determined by its protons., discovery (n.), The act of finding something that was previously unknown., predict (v.), To say that something will happen in the future based on evidence., arrangement (n.), The way things are organized or placed.

exercise 2 - homework

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