(1). 40-Ca, 39-K, and 42-Ti all have the same: a. number of electrons b. atomic
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(1). 40-Ca, 39-K, and 42-Ti all have the same: a. number of electrons b. atomic number c. mass number d. number of (2). Element X, whose atoms have an outer-shell electron configuration of ns2np3, is most likely to react chemically to form ions which have a charge of: a. +3 b. +1 c. -3 d. -2 (3). How many unpaired electrons are there in the Ti3+ ion? a. 0 b. 2 c. 1 d. 4 (4) What is the wavelength of the radiation emitted from a mercury arc sunlamp if the frequence of the radiation is aboult 1.2 x 1015/sec? (c= 3.00 x 1010 cm/sec) a. 2.0 x 10-5 cm b. 4.0 x 10-4 cm c. 2.5 x 10-6 cm d. 2.5 x 10-5 cm (5) The quantum numbers 3, 1, -1, +1/2 refer to: a. an electron in the p orbital of the 3rd shell b. an electron in the p orbital of the 2nd shell c. an electron in carbon d. an electron in the s orbital of the 3rd shell (6) What is the hybridization of the underlined, bolded and italicized C atom in the following compound? H2N-CH2-CON-CH2COOH a. sp3 b. sp2 c. sp d. sp3d2 (7). There are two very intense lines in the atomic spectrum of sodium. The wavelengths are 589.0 nm and 589.6 nm. Which line correspondes to the larger energy value? a. Energy is the same for both lines. b. Energy is greater for 589.0 nm. c. Energy is greater for 589.6 nm. d. Insufficient information was given. (8). What is the atomic number of the 1st element in the periodica table to have a filled orbital? a. 30 b. 2 c. 12 d. 29Explanation / Answer
d. number of protons a. +3 a. 0 b. 4.0 x 10-4 cm b. an electron in the p orbital of the 2nd shell b. sp2 b. Energy is greater for 589.0 nm. b. 2
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