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a repetition of properties occurs when elements are arranged in order of increasing atomic number
subatomic particle that plays the greatest part in determining the properties of an element
electrons are added to the same principle energy level
what causes the shielding effect to remain constant across a period?
an increase in the number of protons
what contributes to the increase in ionization energy from left to right across a period>
a filled highest occupied principle energy level
what electron configuration is most likely to result in an element that is relatively inactive?
it tends to decrease
how does atomic radius change from left to right across a period in the periodic table?
it tends to increase
how does atomic radius change from top to bottom in a group in the periodic table?
electronegativity generally increases from left to right across a period.
what is true about electronegativity?
who arranged the elements according to atomic mass and used the arrangement to predict the properties of missing elements?
which of the following elements has the smallest first ionization energy? sodium, magnesium, calcium, potassium
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