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atomic radii cannot be measured directly because the electron cloud surrounding the nucleus does not have a clearly defined
shielding by inner electrons
the trend in the atmic radii as you move down the group 1 elements is due to
A German chemist that observed that several elements with similar properties could be classified into sets of 3 Triads
Found that when he arranged elements in increasing atomic mass the properties would be similar ever 8th element.
_________ is credited as the father of the periodic table because he was the first to publish and demonstrate his table
________________ When elements are arranged in order of increasing atomic number, their physical and chemical properties show a periodic pattern.
Groups or Families
_______________ the elements with similar properties and are aligned in vertical columns (18)
(B groups) -
Found in the middle of the periodic table
Innertransition Metals (2 pulled out rows)
innertransition metals, the 2 rows under the table. The electrons of the f sublevel do not fill their orbitals in a predictable manner.
________________-atoms tend to gain, lose, or share electrons in order to acquire a full set (8) of valence electrons.
Increase as you move from left to right across a period. Except Noble gases
Decrease as you move down a group.
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