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QUESTION 1 [32]
1. Two high school learners came to you confused about the physical properties of
metals and nonmetal. In a table form, contrast the differences between the physical
properties of metals and nonmetals.
2. The periodic table is the organized array of all the chemical elements in order of
increasing atomic number, that is, the total number of protons in the atomic nucleus.
Please answer the following questions based on the periodic table (7)
2.1 How many electrons, neutrons, and protons does an aluminum atom have? (1)
2.2 How many element groups are there in the periodic table? (1)
2.3 To which group does hydrogen belong? (1)
2.4 What is the atomic weight of copper? (1)
2.5 What is the atomic mass of Nitrogen? (1)
2.6 What is the maximum number of electrons that can be accommodated in a K
shell? (1)
2.7 What is ionization energy? (1)
3. What is the valency of the following elements? (3)
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