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- 1. Multiple ChoiceTrends of the periodic table starts on page 150 of your textbook.I understand.Choose: I understand
- 2. Multiple ChoiceSo far, we have learned that the elements are arranged in the periodic table according to their atomic number and that there is a rough correlation between the arrangement of the elements and their electron configuration. We will further explore the trends of the periodic table in this section.
Why do elements in the same family (or group) generally have similar properties?They have the same number of valence electrons, therefore react the same wayElements in the same family have different numbers of valence electrons, therefore we do not know how they react. - 3. Multiple Choice
"Main group" elements are represented by groups 1 and 2, 13-18. We will refer to "main group" elements throughout this unit.
What is the first element in group 17?fluorineheliumcarbonboron - 4. Multiple ChoiceIn chemistry, a valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond. Similar to an electron in an inner shell, a valence electron has the ability to absorb or release energy in the form of a photon. An energy gain can trigger an electron to move (jump) to an outer shell; this is known as atomic excitation.
Which electrons are involved in chemical bonding?valence electronsinner core electronsprotons are involved in chemical bonding - 5. Multiple ChoiceValence electrons have the ability to absorb or release electrons in the formation of __________.photonsmore electronsmore energy levels
- 6. Multiple ChoiceThe electrons that determine how an atom reacts chemically are those whose average distance from the nucleus is greatest; that is, those with the highest energy.
These are the valence electrons-electrons available to be lost, gained, or shared in the formation of chemical compounds.
Valence electrons are those electrons in the outer energy level. Elements have a maximum of 8 valence electrons.
For example:
The electron configuration for C is 1s22s22p2 So the outer energy level "2" has 4 electrons. If you notice C is in "main group" 14. So carbon has 4 valence electrons.
How many valence electrons does Li have?2157 - 7. Multiple ChoiceHow many valence electrons does the element with the electron configuration 1s2 2s2 have?1248
- 8. Multiple ChoiceHow many valence electrons does boron have?135
- 9. Multiple ChoiceHow many valence electrons does an element with the electron configuration 1s22s22p4 have?648
- 10. Multiple ChoiceHow many valence electrons does Xe have?5418
- 11. Multiple ChoiceThe elements in "main group" 18 have 8 valence electrons. They all have the maximum number (8) electrons in their outer shell.
In other words the "p" orbital is full. This generally means that the noble gases of group 18 are non-reactive.
Helium is in group 18. However, He has an electron configuration 1s2. Helium has no other energy levels therefore it has 2 valence electrons and not 8.
How many valence electrons does Helium have?28unknown18 - 12. Multiple ChoiceThe atomic radius of a chemical element is measured as one-half the distance between the nuclei of identical atoms that are bonded together. Electrons do not have definite orbits, or sharply defined ranges. Rather, their positions must be described as probable locations that taper off gradually as one moves away from the nucleus. This size is typically measured in Angstroms (or 10-10 meters)
Our first trend is a measure of the size of an atom or its _________ _____________.atomic radiusorbitselectrons - 13. Multiple ChoiceThe radii generally decrease along each period (row) of the table, from the alkali metals to the noble gases; and increase down each group (column).
What is the trend in atomic radius down a group?increase in radiusdecrease in radiusno change in radius - 14. Multiple ChoiceWhich of the following elements has the smallest atomic radius: Li, O, C, F?LiOCF
- 15. Multiple ChoiceOf the elements Ca, Be, Ba, and Sr, which has the largest atomic radius?BeBaCaSr
- 16. Multiple ChoiceOf the elements Ca, Be, Ba, and Sr, which has the smallest atomic radius?BeBaCaSr
- 17. Multiple ChoiceOf the elements Al, Mg, Si, Na, which has the smallest atomic radius?AlMgSiNa
- 18. Multiple ChoiceRank the following elements by increasing atomic radius:
carbon, aluminum, oxygen, phosphorus.
Not sure? check out page 151 in your textbookO, C, P, AlAl, P, C, OO,P, C, AlO, P, Al, C - Answer choicesTagsAnswer choicesTags