2 Periodic TrendsThe arrangement of the periodic table shows trends of properties of the elementsBoiling Point:
3 Atomic Radius Atomic Radius is the size of an atom Atomic Radius INCREASES as you move down the periodic tableThis is because you are adding energy levels each time you move down a level in a groupAtomic Radius DECREASES as you move from left to rightThis is because you are adding electrons to the same energy level
5 Electron ShieldingShielding electrons are the electrons in the energy levels between the nucleus and the valence electrons.They are called "shielding" electrons because they "shield" the valence electrons from the force of attraction exerted by the positive charge in the nucleus.Shielding increases as you move down the periodic tableAdding energy levelsShielding has no effect as you move across the table from left to rightNot adding energy levels
6 Ionization Energy The energy required to remove an electron Ionization energy DECREASES as you move down the periodic tableThis is due to shielding effectIonization energy INCREASES as you move left to rightThis is due to the elements increasing atomic charge with no increase in shielding effectThis is mostly due to the atoms wanting to gain an electron to achieve an octet
8 ElectronegativityThe desire of an atom in a molecule to attract electrons to itselfElectronegativity DECREASES as you move down the periodic tableThis is due to shielding effectElectronegativity INCREASES as you move left to rightThis is because the atoms will want to gain electrons to complete the octet
10 Ionic Size The size of an atom as it becomes an ion When an atom loses an electron (ionization energy), the atom decreases in sizeWhen an atom gains an electron, the atom increases in sizeBoth are due to the idea of atomic charge (nucleus is positive, shell is negative)
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