5. Which set has the more similar chemical properties?
a. As, Se, Br
b. Li, C, F
c. Al, Si, P
d. N, P, AS
Which element is the least electronegative element in the periodic table?
a. Cr
b. Ce
c. Cs
d. F
Answers
Electronegativities reported in Pauling units
Data taken from John Emsley, The Elements, 3rd edition. Oxford: Clarendon Press, 1998.
Electronegativity refers to the ability of an atom to attract shared electrons in a covalent bond. The higher the value of the electronegativity, the more strongly that element attracts the shared electrons.
The concept of electronegativity was introduced by Linus Pauling in 1932; on the Pauling scale, fluorine is assigned an electronegativity of 3.98, and the other elements are scaled relative to that value. Other electronegativity scales include the Mulliken scale, proposed by Robert S. Mulliken in 1934, in which the first ionization energy and electron affinity are averaged together, and the Allred-Rochow scale, which measures the electrostatic attraction between the nucleus of an atom and its valence electrons.
Electronegativity varies in a predictable way across the periodic table. Electronegativity increases from bottom to top in groups, and increases from left to right across periods. Thus, fluorine is the most electronegative element, while francium is one of the least electronegative. (Helium, neon, and argon are not listed in the Pauling electronegativity scale, although in the Allred-Rochow scale, helium has the highest electronegativity.) The trends are not very smooth among the transition metals and the inner transition metals, but are fairly regular for the main group elements, and can be seen in the charts below.
Answer:
Cs
Explanation:
The element that is the least electronegative element in the periodic table.