Chapter 6 Periodic Trends Flashcards
(27 cards)
Who first arranged the periodic table in atomic mass
Mendeleev
Who arranged the periodic table according to atomic number
Henry Moseley
What is the octet rule
Elements gain or lose electrons to attain noble configurations
Do metals gain or lose electrons to obey the octet rule
Lose
Do non-metals gain or lose electrons to obey the octet rule
Gain
How do you find effective nuclear charge
of protons - # of inner shielding electrons
Does radius increase or decrease as you move down a group
Increase
Why does the radius increase as you move down a group
More shells are added
Does radius increase or decrease as you move right across a period
Decrease
Why does radius decrease as you move right across a period
The effective nuclear charge increases increasing how much the electrons are attracted to the nucleus
What is ionization energy
The energy required to remove an electron from an atom
Does ionization energy increase or decrease as you move down a group
Decrease
Why does ionization energy decrease as you move down a group
The radius increases making the valence electrons further away from the nucleus therefore making it easier to remove an electron
Ionization energy increases or decreases as you move right across a period
Increases
Why does ionization energy increase as you move right across a period
The radius decreases and the effective charge increases causing the electrons to be more attracted to the nucleus making it harder to remove an electron
What is electronegativity
The tendency for atoms to attract electrons when they’re chemically combined with another element
Electronegativity increases or decreases as you move right across a period
Increases
Why does electronegativity increase when you move right across a period
The radius decreases and the effective charge increases making electrons more attracted
Electronegativity increases or decreases as you move down a group
Decreases
Why does electronegativity decrease as you move down a group
The radius increases making valence electrons further away from the nucleus and not desirable by electrons
What is a dipole
A molecule with 2 poles and has a polar bind
Do metals grow or shrink when they become ionized
Shrink
Why do metals tend to shrink when ionized
They lose an orbital and decrease in repulsion
Do non-metals grow or shrink when ionized
Grow
