4. Atoms and Elements

Give the symbol of the element described by each of the following:a. the alkaline earth metal in Period 2

Why does the fourth period in the periodic table contain 18 elements?

Write the name and symbol of the element with the following atomic number: (4.1, 4.2)h. 92

Look again at the trends illustrated in Figures 2.3 and 2.4.a. How do the peaks/valleys correlate with locations in the periodic table?b. Are there other chemical properties that also exhibit periodic trends? What are they?