Transcript Periodic table trends Answers

Periodic table trends
Answers
THE 9TH CIRCUIT COURT OF APPEALS
DESEGREGATES THE PERIODIC TABLE OF ELEMENTS
Answers
2 a) – He, Ne, Ar, Noble gases
2 b) – Li, Na, K, Alkali metals
3 a) – Li, Na, K, Alkali metals
3 b) – He, Ne, Ar, Noble gases
4. As one increases, the other decreases
5. Ionization energy increases
Atomic radius decreases
6. Ionization energy decreases
Atomic radius increases
7.
11p+
12n°
11p+
12n°
10p+
10n°
Na has 11
electrons
Na+ has 10
electrons
Ne has 10
electrons
electron configuration of Na+ resembles Ne
Alkali metals become like noble gases
8. Radius increases because shells are added
Increased radius will make it easier to lose an
electron because of greater distance between
positive and negative charges
9. Proton # increases. More protons means greater
attraction between nucleus and outer electron thus
higher ionization energy.
The greater attraction also means that outer
electrons are brought closer to the nucleus, thus
smaller atomic radius results.
Li (enc = 1)
++
+
Be (enc = 2)
++
+
+
B (enc = 3)
+++
++
10. Noble gases are ignored
11. Electron affinity is energy associated with an atom
gaining an electron. It is highest in the top right
where atoms are smallest with the greatest number
of protons.
Ionization Energy can be
summarized as
Using only the periodic table, rank the
elements in each set by increasing
ionization energy
a) Xe, He, Ar
a) Xe, Ar, He
b) Sn, In, Sb
b) In, Sn, Sb
c) Sr, Ca, Ba
c) Ba, Sr, Ca
Increasing Ionization Energy
From Friday…
What is the trend for EA?
Using only the periodic table, which
element will have the lower EA?
a) K or Ca
a) K
b) O or Li
b) Li
c) S or Se
c) Se
From Friday…
What is the trend for Atomic
Radius?
Using only the periodic table, rank the
atoms in each set by decreasing atomic
size.
a) Mg, Be, Ba
a) Ba, Mg, Be
b) Ca, Se, Ga
b) Ca, Ga, Se
c) Br, Rb, Kr
c) Rb, Br, Kr
d) Se, Br, Ca
d) Ca, Se, Br
e) Ba, Sr, Cs
e) Cs, Ba, Sr
Complete the following
questions from your textbook.
p. 60 #1-6