b. Assessment / What I can show 7 Activity 8: "Gained or Lost " Directions: Indicate how many electrons must be gained or lost by each of the following atoms to achieve a stable electron configuration (Ex: 3 lost, 2 gained) 1. Sr 2. Sb 3. Xe 4. S 5. Se MY SCORE: D. Guide Questions

Which drawing best represents the atomic model? A, B, C or D?

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6.  The uncertainty of position of a neutron is 1.1 x10-4.    Calculate the uncertainty in measuring the speed.   Group of answer choices a. 2.9 x 10exp-4 m/ s b. 0.29 m/s c. 1.80 x 10exp-10 m/ s d. 1.22 m/s

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Alpha emissions from Po-210 are used in paper manufacturing to reduce static electricity. This is possible since alpha particles   can easily knock off electrons   catalyze chemical reactions, which involve valence electrons   are positively charged so they attract electrons   create enough heat to catalyze chemical reactions that use up electrons

3s2 signifies that the electrons are in shell number the electrons are in a subshell type there are electrons in this designation а. О b. 1 С. 2 d. 3 е. 4 f. 5 g. 6 h. s i. p j. d k. f

What value is the closest estimate of Zeff for a valence electron of the calcium atom? A. 1 B. 2 Zeff = 20 protons - 18 core electrons = 2 C. 6 D. 20 E. 40

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