Periodic table

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  1. 2. Model , The blank is a planetary model in which the negatively-charged electrons orbit a small, positively-charged nucleus similar to the planets orbiting the Sun (except that the orbits are not planar
  2. 3. Rule , The blank is a chemical rule of thumb that reflects observation that elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.
  3. 5. ; A blank in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. ... Arranged this way, groups of elements in the same column have similar chemical and physical properties, reflecting the periodic law.
  4. 10. ; located on the left of the periodic table,
  5. 11. , the ability of an atom to attract shared electrons in a covalent bond. The higher the value of the blank, the more strongly that element attracts the shared electrons.
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  1. 1. : In chemistry, a family is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the f-block columns (between groups 3 and 4) are not numbered.
  2. 4. , are located on the upper right. They are separated by a diagonal band of semi-metals.
  3. 5. Table , a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.
  4. 6. Energy ,The blank of the elements increases as one moves up a given group because the electrons are held in lower-energy orbitals, closer to the nucleus and thus more tightly bound (harder to remove).
  5. 7. Mass , The blank of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as Dalton, D). The blank is a weighted average of all of the isotopes of that element,
  6. 8. , They are located to the right of the post-transition metals and to the left of the non-metals
  7. 9. Electron Shell , In chemistry and atomic physics, an electron shell, or a principal energy level, may be thought of as an orbit followed by electrons around an atom's nucleus. The closest shell to the nucleus is called the "1 shell", followed by the "2 shell", then the "3 shell", and so on farther and farther from the nucleus.