Question

set a: data and graphing for group 2 alkaline earth metals:
objective: to observe trends by plotting and graphing data
using reference table s, complete the tables below for the group 2 alkali earth metals..
once done, scale, plot and graph the data on the graphing grids to observe trends of the four
properties.
group 2: alkaline earth metals. list elements in order from top to bottom
atomic
number
elements
symbol
electronegativity
ionization
energy
atomic
radius (pm)
melting
point (k)
trend in electronegativity
electronegativity value
atomic numbers
trend in ionization energy
ionization energy (kj/mol)
atomic numbers
trend in atomic radius (size)
(pm)
atomic numbers
trend in melting point
melting point (k)
atomic numbers

Explanation:

Step1: Gather Data for Group 2 Elements

Group 2 Alkaline Earth Metals (top to bottom): Be (Atomic No. 4), Mg (12), Ca (20), Sr (38), Ba (56), Ra (88). Use Reference Table S (or periodic table) to get:

• Electronegativity: Be≈1.57, Mg≈1.31, Ca≈1.00, Sr≈0.95, Ba≈0.89, Ra≈0.9.
• Ionization Energy (1st, kJ/mol): Be≈899, Mg≈737.7, Ca≈589.8, Sr≈549, Ba≈502.9, Ra≈509.3.
• Atomic Radius (pm): Be≈112, Mg≈160, Ca≈197, Sr≈215, Ba≈242, Ra≈260.
• Melting Point (K): Be≈1560, Mg≈923, Ca≈1115, Sr≈1042, Ba≈1000, Ra≈973.

Step2: Scale and Plot on Graphs

For each graph (Electronegativity, Ionization Energy, Atomic Radius, Melting Point), set x - axis as Atomic Numbers (4, 12, 20, 38, 56, 88) and y - axis as the property value.

• Electronegativity Trend: Plot points (4, 1.57), (12, 1.31), (20, 1.00), (38, 0.95), (56, 0.89), (88, 0.9). Connect to see a decreasing trend (slight rise at Ra, but overall down).
• Ionization Energy Trend: Plot (4, 899), (12, 737.7), (20, 589.8), (38, 549), (56, 502.9), (88, 509.3). Connect to see a decreasing trend (small rise at Ra).
• Atomic Radius Trend: Plot (4, 112), (12, 160), (20, 197), (38, 215), (56, 242), (88, 260). Connect to see an increasing trend (as atomic number increases, radius increases due to more electron shells).
• Melting Point Trend: Plot (4, 1560), (12, 923), (20, 1115), (38, 1042), (56, 1000), (88, 973). Connect to see a decreasing trend (with Ca having a higher mp than Mg, but overall down from Be to Ra).

Step3: Analyze Trends

• Electronegativity: Decreases down the group (less attraction for electrons as shells increase).
• Ionization Energy: Decreases down the group (valence electrons are farther from nucleus, easier to remove).
• Atomic Radius: Increases down the group (more electron shells, shielding increases).
• Melting Point: Decreases down the group (metallic bonding weakens as atoms get larger).

Answer:

To complete the task:

1. Gather data for Group 2 elements (Be, Mg, Ca, Sr, Ba, Ra) from a periodic table/reference.
2. Plot each property (Electronegativity, Ionization Energy, Atomic Radius, Melting Point) vs. Atomic Number on the provided graphs.
3. Observe trends: Electronegativity and Ionization Energy decrease; Atomic Radius increases; Melting Point generally decreases down Group 2.

(Note: For specific graph plotting, use the scaled axes and plot each data point accurately.)