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Periodic Table of Elements
Periodicity test review
Terms in this set (12)
when elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties. Elements that have similar chemical and physical properties end up in the same column in the periodic table.
the elements in Group 8A. These nonmetals are sometimes called the inert gases because they rarely take part in a reaction, and do no interact with other elements because they already have 8 valence electrons. These elements have distinct colors when they are charged with electricity.
the tendency to recur at intervals
elements are arranged in order of increasing atomic number; put into similar families if they have similar properties.
there are 7 () in the table; each () corresponds to a principal energy level. There are more elements in higher numbered () because there are more orbitals in higher energy levels.
one half the distance between the nuclei of two atoms of the same element when the atoms are joined. This is measured in picometers (pm); there are one trillion pms in a meter.
the energy required to remove an electron from an atom. This energy is measured when an element is in its gaseous state. The energy required to remove the first electron is called the first ionization energy. The cation produced has a +1 charge. Ionization energy can help predict what ions an element will form.
the energy change when an electron is added to the neutral species to form a negative ion. This property can only be measured in an atom in gaseous state.
an electron in the highest occupied energy level of an atom.
a measure of the size of an atoms ion in a crystal lattice, measured in pms
the ability of an atom of an element to attract electrons when the atom is in a compound. These values decrease from top to bottom.
What was Mendeelv's invovlement with the periodic table?
In 1869, Dmitri Mendeleev developed the periodic table. He arranged the elements into groups based on repeating properties for his students to learn from. He left spaces for predicted elements. His table was generally accepted because his prediction of unknown elements was correct, and also because he was able to explain his theory clearly.
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