How many valence electrons does a tin (Sn) atom have? Select one: а. 1 b. 3 С. 4 d. 5 е. 2

5. Down a group in the periodic table: Do you think the ionization energy of Lithium (Li) is larger or smaller than that of Sodium (Na)?A. Larger B. Smaller C. Same D. Don’t KnowWhat did you base your answer on?6. Across a row in the periodic table: Do you think the ionization energy of Lithium (Li) is larger or smaller than that of Neon (Ne)?A. Larger B. Smaller C. Same D. Don’t KnowWhat did you base your answer on?

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

6. Arrange the following elements in order of a. increasing ionation energy: fluorine, helium, carbon, beryllium b. decreasing size: tin, palladium, rubidium, cesium

Depict the electron configuration for each of the following atoms using noble gas notation: (Express your answer using the noble gas notation. For example, the electron configuration of Li would be entered as [He]2s¹.) a. Fluorine, F. A deficiency of F can cause increased dental caries and possibly osteoporosis, but larger amounts are poisonous. b. Xenon, Xe. It ranks eleventh in abundance of the gases in Earth's atmosphere.