Periodic Table
What name do the following groups have on the periodic table?
Group 1A
Group 7A
Group 2A
Group 1A = alkali metals
Group 7A = halogens
Group 2A = alkaline earth metals
Arrange the following atoms in order from smallest to biggest.
Ba, Be, Ca, Mg
Be-Mg-Ca-Ba
How many periods are on the periodic table?
7
Most reactive nonmetal
fluorine
What element can have either a +1 or -1 oxidation number?
hydrogen
What is the general electron configuration for the outermost electrons of elements in Group 2A?
ns2
Name the group:
1. Most reactive nonmetals
2. Contains elements that are solids, liquids, and gases at room temperature
3. Most stable elements
1. Halogens
2. Halogens
3. Noble gases
Which period contains the most elements?
6
Which of the following elements would have the biggest atoms?
Ca, Sr, Ga, In
Sr
What two elements on the periodic table are liquids at room temperature?
Mercury, Bromine
Which one of the following is NOT isoelectronic with Kr?
As+3, Se-2, Rb+1, Sr+2, Br-1
As+3
Arrange the following elements in order from lowest electron affinity to highest electron affinity.
Br, F, I, Cl
I-Br-Cl-F
Arrange the following atoms in order of increasing atomic radius.
Fe, Br, K, Kr, Rb
Kr-Br-Fe-K-Rb
Which of the following elements has the highest first ionization energy?
Cs, Ga, K, Bi, As
As
What is the electron configuration for the Fe+3 ion?
[Ar] 3d5
What was the chief contribution of physicist Henry Moseley to the periodic table?
He measured the atomic number of elements and arranged the periodic table by atomic number vs. atomic mass
Which group(s) on the periodic table show(s) the most variability in properties of the elements that make it up? Why?
Groups 4 and 5. They both contain metals, nonmetals, and metalloids
Arrange the following ions in order of increasing size.
C-4, F-1, N-3, O-2
F-1 , O-2, N-3, C-4
Element that Mendeleev named "eka-aluminum".
Gallium
The successive ionization energies of a certain element are as follows:
I1= 578 kJ
I2= 1,820 kJ
I3=2,750 kJ
I4=11,600 kJ
Give a possible element that would fit this pattern.
Group 3A = Aluminum
How many valence electrons do each of the following particles have?
Ni
Cl-1
Mn+7
Al
He
Ni = 2
Cl-1 =8
Mn+7 = 8
Al = 3
He =2
Name the group:
1. most reactive metals
2. 3 valence electrons
3. -3 ions
4. reacts vigorously with water
5. ns2p4
6. most are diatomic
7. stable
8. +2 ions
1. most reactive metals = alkali metals (1A)
2. 3 valence electrons (3A)
3. -3 ions (5A)
4. reacts vigorously with water (1A)
5. ns2p4 (6A)
6. most are diatomic (7A)
7. stable (8A)
8. +2 ions (2A)
Describe the trend seen across a period from left to right for each of the following properties:
1. atomic radius
2. ionization energy
3. electron affinity
1. decreases
2. increases
3. increases
Which of the following ions has the largest radius?
Cl-1, K+1, S-2, Na+1, O-2
S-2
Which of the naturally occurring elements were discovered last? Explain why.
Noble gases. They didn't react with anything, so they were difficult to detect. Also odorless and colorless.