Check yourself
Drinking cranberry juice
Is this for a grade?
My wifi is out?
FLVS bluez
100
Why do atoms get smaller as you move across a period?
More protons = more pull
greater ENC
100
Who is larger K or Li and why?
K
More rings = shielding
100
Who is larger Ca or Ca 2+...why?
Ca... Ca2+ smaller....losing electrons makes radius decrease because of decreased repulsion?
100
What is a valence electron?
electrons that are found in the outermost energy level.
100
Who created modern version of periodic table?
Mendeleev
200
Why do atoms get larger as you go down a group?
adding energy levels= more rings
shielding effect Bruh!
200
Why does O have a lower ionization energy than N?
2p4 electron creates repulsion which makes e- easier to remove
200
What is isoelectronic?
Ions will have same number of electrons
200
Name two exception to ionization trend
B or Al
O or S
200
In a group (column)
the chemical and physical properties are most likely similar
300
Why do cations get smaller?
When a cation loses an electron, it has 1 (or more) fewer than it had before. The amount of repulsion between electrons decreases
300
What is ENC?
positive charge that an electron experience from the nucleus. Increases from left to right across the period
300
What is Ionization Energy?
the amount of energy required to remove an electron.
300
Transition Metals (group)
groups 3-12.
300
What are properties of nonmetals?
elements the do not conduct electricity, are not shiny and do not conduct heat
400
Why do anions get bigger?
When an anion gains an electron, it has 1 (or more) more than it had before. The amount of repulsion increases between the electrons.
400
Explain the Shielding Effect
Adding a energy level(ring)
Refers to the protection of valence electrons by core electrons in inner energy levels (distance)
400
Electronegativity
the ability of an atom to attract electrons when the atom is in a compound
400
Alkaline Earth Metals (group)
group 2 on the periodic table.
400
When would you expect to see a jump in successive ionization energy for Si?
the 5th e-, it would be a core electron
core = closer harder to remove
500
How are atomic radius and ionization energy related?
smaller radius means greater ionization energy
closer the e- the harder it is to remove
500
Which has a greater ionization energy C or N?
Why?
N- Greater ENC
smaller radius
Higher IE( closer e- easier to remove)
500
Why is the ionization energy lower for B than Be?
the 2p1 has less penetration into the electron cloud(slightly farther = easier to remove)
500
What is a core electron?
electrons that are in inner core and are harder to remove
500
Elements in the same column have similar properties because ______________________ (not a one word answer, an explanation)
they have the same number of electrons in the outer orbital (called valence electrons)
