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Unformatted text preview: CHE-105 Chapter 2 Homework Name KEY . 1. Examine Figure 2.7 - 1.1 Which type of electromagnetic radiation has the highest energy? a. gamma rays 1.2 Which has the longest wave length? f. microwaves 1.3 Which has a frequency just lower than UV? d. visible rays a. gamma rays c. UV rays e. IR rays b. x-rays d. visible rays f. microwave rays 2. How many valence electrons does each atom have? 2.1 Ca __ 2 __ 2.2 Mg __ 2 __ 2.3 Li __ 1 __ 2.4 P __ 5 __ 2.5 O __ 6 __ 3. Which subatomic particle 3.1 is least massive? electron 3.2 is uncharged? neutron 3.3 is negatively charged? electron 3.4 is positively charged? proton 4. (Indicate all that apply) The element, oxygen - 18 (i.e. O 18 8 ) a. is an allotrope of oxygen that contains 18 oxygen atoms b. is an isotope of oxygen c. has 10 neutrons d. has 18 neutrons e. has 8 protons f. has 8 neutrons 5. ( Indicate all that apply ) All neutral atoms of the same element have a. the same mass number b. the same number of protons c. the same number of neutrons d. the same number of electrons 6. 6....
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- Spring '08