ck-12
effective nuclear charge equation
#protons-#of shielding electrons
what does bigger atomic radius mean
An atom gets larger as the number of electronic shells increase
what is the for atomic radius trend as atomic number increases
As the atomic number increases, Atomic radius increases
Why is the number of protons and electrons important in periodic trends?
Protons are positive and electrons are negative and so there is an attraction between the opposing charges
Which of the metal is best at conducting both heat and electricity?
Silver
Atomic radius ___ across a period. (left to right)
decreases
shielding electrons
electrons in the energy levels between the nucleus and the valence electrons
[true/false] elements in the same group have the same number of shielding electrons
false
metal properties
good conductors of heat and electricity; malleable; solid at room temp; more dense than water; ductile; have luster
What happens to the number of shells around the nucleus as you go down a column?
increases
atomic radius ___ down a group.
increases
How are effective nuclear charges and atomic radius related?
inversely proportional, when the effective nuclear charge is bigger, the atomic radius is smaller
Metallic character is highest in the _____ portion of the periodic table
lower left
anions
negatively charged ions
what are shielding electrons ?
non-valence electrons, Inner electrons
atomic radius formula
one-half the distance between the nuclei of identical atoms that are bonded together
The units for atomic radii
picometers, equal to 10^-12 meters
ions
positively and negatively charged atoms (different amount of protons and electrons)
cations
positively charged ions
Metallic and nonmetallic character best refers to the _____ of a given element.
reactivity
atomic radius
size of an atom from the center of the nucleus out to the furthest valence electron
atoms
smallest unit of matter (same amount of protons and electrons)
If there is more protons and electrons in the atom, the [stronger/weaker] the attractive force
stronger
In the periodic table, the element with the largest atomic radii is found in:
the bottom left of the periodic table
effective nuclear charge
the net positive charge experienced by valence electrons
shielding effect
the reduction of the attractive force between a nucleus and its outer electrons due to the blocking effect of inner electrons
what is the relationship between the distance between the particles and the force of attraction?
they are inversely related i.e: the greater the distance, the weaker force of attraction
What do shielding electrons shield
they shield the valence electron from the force of attraction exerted by the protons in the nucleus
[true/false] Elements which show properties of both metals and nonmetals are called metalloids.
true
[true/false] elements in the same period have the same number of shielding electrons
true