Reactivity/Atomic Radius
Which group of elements is the most reactive of the metals?
Group 1, Alkali Metals
Oxygen has _______ valence electrons
6
An element's reactivity may depend on its number of _____________ ________________ .
Valence electrons
Phosphorus is a ______(metal/nonmetal)
nonmetal
Define Ionization Energy
The energy it takes to remove an electron from an atom.
Which is more reactive? F or Cl?
F
Chlorine is most likely to _______(gain/lose) electrons
Gain
Which has a higher ionization energy? Li or O?
The group with reactive metals with 2 valence electrons.
Group 2, Alkaline Earth Metals
Which element has a higher electron affinity? Aluminum or Fluorine?
Fluorine
Compare to Potassium (K), Iron (Fe) is ________(more/less) reactive.
Less
The charge of Bromine (Br) after it forms an ion is______.
-1
Identify the following element based on its electron configuration: [Ar] 4s²
Calcium
Which group of elements is MOST LIKELY to react with elements from the alkali metal group?
Halogens, Group 17
Which element has the highest ionization energy?
Fluorine
Which is larger? K or Fr?
Fr
Cations are __________(larger/smaller) than their parent ions.
Smaller
Down a group, what happens to atomic radius?
Increases
Which elements are most likely to react?
Mg and O or Ca and Ni
Mg and O
Left to right in a period, ionization energy _________(increases/decreases)
Increases
Left to right across a period, atomic radius _________(increases/decreases)
decreases
When an atom forms an anion, it __________(loses/gains) electrons.
gains
Which trend can be described as an atom's "desire" to gain an electron?
Electron affinity
Why do the elements in group 18 not react with other elements?
They have a full outer shell of 8 valence electrons.
Electron shielding causes ionization energy to ________ down a group
decrease