Unit 3 Review . Chemistry. 1. Label the periodic groups. #1 Alkali Metals. # 2Alkaline Earth Metals. # 8 Noble Gases. # 7 Halogens. Transition Metals. 2. Circle the most EN element and square the least EN element 3. Highest IE red and lowest IE blue. Small atoms! High IE and EN.
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# 8 Noble Gases
# 7 Halogens
High IE and EN
LARGE atoms, low IE and EN
increasing atomic #
8. The periodic table is organized by_______________
Nonmetals (blue for review wksht)
Metalloids (green – for review worksheet)
11) Have 1 valence electron ____________________
12) Have 8 valence electrons
13) Have 7 valence electrons
14) Have 2 valence electrons
Noble Gases – group 18
Halogens – group 17
Alkaline Earth metals – Group 2
15) The least reactive elements
16) The most reactive nonmetals (gases at room temperature)___________________
17) The most reactive metals
18) Reacts explosively with oxygen and water ____________________
19) Used to make coins and jewelry.
20) Energy required to remove an electron from an atom____________________
21) The ability of atom to attract electrons.
22) List 3 other elements that will have similar chemical properties to Nitrogen and explain why.
Most like: Phosphorus (P)
2nd most like: Arsenic (As)
3rd most like: Antimony (Sb)
Same group –gives them same # of valence electrons and ion charge, therefore similar reactivity!
a. Li, N b. Kr, Ne c. Cs, Li
Explain the octet rule.
Circle the element in the pair is more electronegative. Explain Why?
a. K, As b. N, Sb c. Sr, Be
Closer to Fluorine!
Atoms will lose, gain, or share electrons to have 8 valence electrons in their outer energy level.
Smaller atoms – less shielding – nucleus charge is stronger and can attract the electron more easily.
a. repetition of their physical properties when arranged by increasing atomic radius.
b. repetition of their chemical properties when arranged by increasing atomic radius.
c. periodic repetition of their properties when arranged by increasing atomic number.
d. periodic repetition of their properties when arranged by increasing atomic mass.
a. atomic radius, ionization energy
b. atomic radius, electronegativity
c. ionization energy, electronegativity
d. none of the above
Which will form a larger ionic radii than its’ parent atom?
a. cation (+ ion) b. anion (- ion)
Explain your choice!
Extra electrons cause repulsion and cloud spreads out – ion gets bigger!
23) How many electrons does an atom of Oxygen have? _____
How many valence electrons?________
How many electrons does 0-2 have? _____
24) Fluorine has a higher ionization energy than oxygen because fluorine has a larger ____________ charge (why fluorine holds on to its electrons so well)
10 total, 8 valence
25) Which element is this for? ____________________-
26) In which period is this element found in?______ In which group #? _______
27) How many electrons are in this element’s 3rd energy level? _____
28) Re-write the electron configuration of this element if it became an ion with a +2 charge
1s2 2s2 2p6 3s2 3p6
It loses the 2 electrons in 4s
29) What is an orbital? A ____________ shaped region of an atom where an ____________ is most likely to be found.
30) How many orbitals (circles) are in each sublevel? a. S = ___ b. P = ___
c. d = ___ d. F = ____
31) How many electrons can fit into 1 orbital? _____
3s 3p 4s 3d
It is not correct, the 3d orbitals should have one in each orbital and then it should double up!
34) Identify the blocks where these groups are found –
a. Halogens = ____ block
b. Alkaline Earth Metals = _____ block
c. Alkali Metals = ______ block
d. Rare Earth Metals = ______ block
e. The Noble Gases = _____ block
f. The Transition Metals = _______ block
A: Hydrogen & Helium
B: Helium, Barium, Sodium
C: Barium, Calcium, Hydrogen, Helium
36) An electron that is closest to the nucleus possible (at the lowest energy level possible) is said to be in its ___________ _________________.
37) When an electron jumps up to a higher energy level and then falls back to its ground state a ___________ is released.
38) The amount of energy released by an electron jumping from the 4th energy level back to its ground state at the 3rd energy level will always release a photon with a___________________________ (different-variable/specific-quantized) amount of energy.
39) The color spectra (types of colors produced) of a star can be used to identify the types of ______________ present in the star.