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