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Chapter 11: Problem 7

Compare the properties of Be and Al.

Short Answer

Expert verified
Beryllium and Aluminium are both metals but have different properties. Beryllium has a lower atomic number, atomic weight, density, melting point and boiling point than Aluminium. Beryllium is in group 2, period 2, while Aluminium is in group 13, period 3. Beryllium’s electronic configuration is simpler than Aluminium’s. Beryllium has a grey appearance while Aluminium has a silvery-white appearance.

Step by step solution

01

Gathering Information about Beryllium (Be)

First, gather all necessary information about Beryllium. From a periodic table or other resource, find its atomic number (4), atomic weight (9.0122), electronic configuration (\(1s^2 2s^2\)), group (group 2, also known as the alkaline earth metals), period (period 2), appearance (grey metallic), density (1.85 g/cm^3), melting point (1560 °C), and boiling point (2742 °C).
02

Gathering Information about Aluminium (Al)

Next, gather all necessary information about Aluminium. From a periodic table or other resource, find its atomic number (13), atomic weight (26.9815), electronic configuration (\(1s^2 2s^2 2p^6 3s^2 3p^1\)), group (group 13), period (period 3), appearance (silvery-white metallic), density (2.70 g/cm^3), melting point (660.3 °C), and boiling point (2519 °C).
03

Comparing Properties

Now, compare these properties. Beryllium has a lower atomic number, atomic weight, density, melting point and boiling point than Aluminium. Beryllium is in a different group (group 2) and period (period 2) compared to Aluminium (group 13 and period 3). The electronic configuration of Beryllium is simpler than that of Aluminium. Both are metals and have a metallic appearance, but Beryllium's is gray while Aluminium's is silvery-white.

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