Periodic Tables on the Web

Useful Links for this Unit

http://www.webelements.com

http://www.chemicool.com/

http://pearl1.lanl.gov/periodic/default.htm

http://www.chemicalelements.com/

http://chemlab.pc.maricopa.edu/periodic/periodic.html

Your answer choices: a. Ionization Energy b. Electron Affinity c. Electronegativity d. Atomic Radius

Which has to do with energy of loosing electron s? answer ionization energy is the energy needed to remove a valence electron. EA and EN are related to gaining e-. radius has to do with size, not directly with ionization.

Which is most directly related to the size of the atom? answer tricky question - best answer is d. radius but the size influences the other three very much IE is lower for atoms where the valence electrons are far from the nucleus. EA and EN are generally lower the larger the radius (atleast within the same family)

Which others are related to size? answer all the others - read the answer above

Which has to do with how electrons are shared? answer electronegativity is the measure of attraction an atom has for a shared pair of electrons energy is not being measured here, nor are ions being formed this is relative number, not a measured value

Which two do you think are most similar? Why? answer this one will depend on your 'why' arguments could be made for several realtionships I would go with EA and EN as they both relate to the desire FOR additional electrons I can see a good argument made for EA and IE also as they both deal with ion formation - one + and the -.

Which is related to the energy of forming an anion? answer an anion is a negative ion - therfore we need the one related to GAINING electrons, since gaining electrons makes the atom a neg ion that would be the electron affinity

Which has trend of increasing across a period? answer answer several answers here IE increase across and so does EN EA gets more negative, so the number is larger, but the sign negative this means more energy is released - so some folks see that as increasing but radius is a big NO - radius decreases any way you look at it across a period

Which has trend of decreasing down a group? answer IE decreases down EN decreases down as well EA isn't very clear cut in a trend in a family/group Radius obviously increases down!

Other Questions:

A period goes left/right or up/down the periodic table? answer periods are the rows left/right

Most elements are metals, nonmetals, metaloids, semimetals answer most are metals. look at the PT you colored and page 156 - 157 in your book - blue are all metals!

Transition metals are found on the left, right or middle of the periodic table answer the middle - the d block elements see the middle d block elements on page 156-157

Group 1 metals are in general the most or least reactive metals. answer Group 1 - the Alkali Metals are the most reactive!

An ion and an isotope are basically the same thing - true or false answer FALSE - they may both start with the letter i and be related to atoms but they are nothing alike. ions are atoms that have gained or lost electrons - becoming charged isotopes are atoms of one element that have different numbers of neutrons from one another

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