Transcript (PPTX, 1.32MB) - Williamsburg High School for

Do Now
What is the most likely atomic radius of
element Yy?
1.
103 pm
2.
127 pm
3.
166 pm
4.
185 pm
Do Now
Write down three questions you still have about periodic trends
Periodicity, Part 3
WILLIAMSBURG HIGH SCHOOL FOR ARCHITECTURE AND DESIGN
MR. QUINN AND MS. TOM
10/30/13
Aim
How can we explain trends in atomic radius
and electronegativity across periods?
Think Back:
What happens to atomic radius across a period?
What happens to electronegativity across a period?
Two Factors of Gravitational Pull
1. Size of the objects
2. Distance of the objects
Gravity: the Earth and the Moon
Gravity is independent of number of objects!
Gravity and Size…
Gravity is dependent on the size of objects!
Gravity vs. Electrical Force
???
So What About Nuclear Charge?
Nuclear charge increases left to right!
One Difference between gravity and
electrical pull:
Electrical pull can be lessened by opposite charges.
Two Quick Definitions
Valence Electrons: electrons in the outer shell
Kernel Electrons: electrons not in the outer shell
Fade Into Obscurity…
Round 2 …
Recap:
1. Number of valence electrons doesn’t affect the pull on EACH electron
2. A larger nucleus pulls harder
3. Having electron shells in the way obscures the nucleus
Spy vs. Spy, Round 1
The distance across an atom of an element in the solid phase is 256
pm. The atomic radius of an atom of this element is closest to
1. 64 pm
2. 128 pm
3. 256 pm
4. 512 pm
Spy vs. Spy, Round 2
Which of the following electron configurations represents the
element with the smallest atomic radius?
1. 2-4
2. 2-5
3. 2-6
4. 2-7
Spy vs. Spy, Round 3
The ability of carbon to attract electrons is
1. greater than that of nitrogen, but less than that of oxygen
2. less than that of nitrogen, but greater than that of oxygen
3. greater than that of nitrogen and oxygen
4. less than that of nitrogen and oxygen
Spy vs. Spy, Round 4
Atoms of which of the following elements have the smallest atomic
radius?
1. Si
2. P
3. S
4. Cl
Spy vs. Spy, Round 5
Which Group 17 element has the least attraction for electrons?
1. F
2. Cl
3. Br
4. I
Spy vs. Spy, Round 6
An atom of which element has the greatest attraction for the
electrons in a bond with a hydrogen atom?
1. Chlorine
2. Phosphorus
3. Silicon
4. Sulfur
Spy vs. Spy, Round 7
As the elements is Period 3 are considered in order of increasing
atomic number, there is a general decrease in
1. atomic mass
2. atomic radius
3. electronegativity
4. first ionization energy
Spy vs. Spy, Round 8
Which electron configuration represents the atom with the largest
atomic radius?
1. 1
2. 2-1
3. 2-2
4. 2-3