Calculate the number of protons, neutrons, and electrons in: (a) 17^37 CI; (b)^2

Question

Calculate the number of protons, neutrons, and electrons in: (a) 17^37 CI; (b)^2311 Na; (c)^84 36 Kr. The element lithium has two naturally occurring isotopes. One of these has a mass of 6.0151 ar and a natural abundance of 7.49%. A second isotope has a mass of 7.0160 amu and a natural abundance of 92.51%. Calculate the atomic mass of lithium. (a) Which group of the periodic table is known as the alkali metals? List them. (b) Which group of the periodic table is known as the halogens? List them.(c) Which group of the periodic table is known as the noble gases? List them. For each of the elements Ca, K, Cu, Zn, Br, and Kr, provide the following information: (a) Which metals? (b) Which are main-group metals? (c) Which are inert or noble gases? Using the periodic table, write the electron configuration and orbital diagram of each of the following atoms: (a) B; (b) S; (c) Ar. Which of the following pairs of atoms and/or ions are isoelectronic with one another? (a)F-.CI- (b) K+, Ar Arrange each of the following lists of elements in order of increasing atomic size: (a) N, O, F (b) Li, K, Cs (c) CI, Br, I

Explanation / Answer

1. Cl-> A = 37g/mol , p+ = 17, e- = 17 , n0= 20...

Na -> A= 23g/mol, p = 11 , e- = 11 , n0 = 12

Kr -> A = 84g/mol, p = 36, e- = 36, n0 = 48

2. 6.0151*0.0749 + 7.061*0.9251 = 7.01027 amu

3. The Alkali Metals are:

4. noble gas -> Kr, main group metals ->K, Ca, metals-> Cu, Zn, Halogen -> Br

7. Atomic radii vary predictably across the periodic table. For instance, the radii generally decrease along each period (row) of the table from left to right and increase down each group (column).

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