chemical periodicity
-
topic 2
* the resultant / retnuclear charge acting on valence
~ electrons
- definition of effective nuclear =
the actual vet
in the atom
magnitude of positive charge that is experienced by an electron
" "
charge (ENC) ~ nuclear charge __ electrostatic forces of attraction between protons and
electrons
aka electron electron repulsion
- describe the shielding effect
-
-
=
where an electron is partially shielded from the positive charge of the nucleus by
the other electrons
- why are the core electrons the =
because the core electrons are directly between the nucleus and the valence
most effective to shield one another electrons
electrons are
core electrons surrounding the nucleus shields the valence electrons from
-
simultaneously
attracted to the
nucleus and repelled the full nuclear charge
by one another.
* His core electrons that provide substantial shielding
2 effective ( ENG ) 2- 0
- in general, the effective nuclear - -_
-
2 nuclear charge ( number of protons )
charge is given by...
=
~
0 =
shielding constant ( number of core electrons )
Na 11522522 PG35 )
'
~
e. g.
i. ENC = 11-10=1
- explain the ENC across a period, -
electrons are added -10 the valence shell going across a period
and why this is so ~
ENC increases because tnenumberofcore electrons stay -1M same
but the proton number increases
- definition of atomic radius =
the distance between tnennaeusofana-omandi-svaie.me shell
effective nuclear attraction for outer electrons
-
- what determines the radius of an
weave only interested in the -
number of shells the electrons occupy
atom atomic radius of main group
elements ( not transition
elements )
atomic radii decreases across a period
-
- what is the trend of atomic radii ~
the number of shells with electrons stay the same but ENC increases
across the period, explain why -
atoms get smaller
moving from left -10 right , number of protons and number of electrons
-
increases intveatom
electrons are added to the valence electrons electrons are not
-
-_
able -10 Shield the
~ ENC increases
increased nuclear
* T valence electrons attraction -10 charge well
the nucleus
* drawn closer to the nucleus , t atomic size across any period
- what is the atomic radii trend -
atomic radii increases going down the group
down any group, explain why ~
the number of shells with electrons increases
~
ENC remains similar
- explain the atomic radii trend for ~
atoms get smaller
down the group (reasons) going from top -10 bottom ENC remains similar but the number of
-
,
energy levels containing electrons increases
number of shells T outermost shelves further from the
~
,
nucleus
* distance from the nucleus -10 the valence electron T
* atomic size T
-
topic 2
* the resultant / retnuclear charge acting on valence
~ electrons
- definition of effective nuclear =
the actual vet
in the atom
magnitude of positive charge that is experienced by an electron
" "
charge (ENC) ~ nuclear charge __ electrostatic forces of attraction between protons and
electrons
aka electron electron repulsion
- describe the shielding effect
-
-
=
where an electron is partially shielded from the positive charge of the nucleus by
the other electrons
- why are the core electrons the =
because the core electrons are directly between the nucleus and the valence
most effective to shield one another electrons
electrons are
core electrons surrounding the nucleus shields the valence electrons from
-
simultaneously
attracted to the
nucleus and repelled the full nuclear charge
by one another.
* His core electrons that provide substantial shielding
2 effective ( ENG ) 2- 0
- in general, the effective nuclear - -_
-
2 nuclear charge ( number of protons )
charge is given by...
=
~
0 =
shielding constant ( number of core electrons )
Na 11522522 PG35 )
'
~
e. g.
i. ENC = 11-10=1
- explain the ENC across a period, -
electrons are added -10 the valence shell going across a period
and why this is so ~
ENC increases because tnenumberofcore electrons stay -1M same
but the proton number increases
- definition of atomic radius =
the distance between tnennaeusofana-omandi-svaie.me shell
effective nuclear attraction for outer electrons
-
- what determines the radius of an
weave only interested in the -
number of shells the electrons occupy
atom atomic radius of main group
elements ( not transition
elements )
atomic radii decreases across a period
-
- what is the trend of atomic radii ~
the number of shells with electrons stay the same but ENC increases
across the period, explain why -
atoms get smaller
moving from left -10 right , number of protons and number of electrons
-
increases intveatom
electrons are added to the valence electrons electrons are not
-
-_
able -10 Shield the
~ ENC increases
increased nuclear
* T valence electrons attraction -10 charge well
the nucleus
* drawn closer to the nucleus , t atomic size across any period
- what is the atomic radii trend -
atomic radii increases going down the group
down any group, explain why ~
the number of shells with electrons increases
~
ENC remains similar
- explain the atomic radii trend for ~
atoms get smaller
down the group (reasons) going from top -10 bottom ENC remains similar but the number of
-
,
energy levels containing electrons increases
number of shells T outermost shelves further from the
~
,
nucleus
* distance from the nucleus -10 the valence electron T
* atomic size T
