... The columns on a Periodic Table that arrange the elements by the number of electrons that are in
the outermost shell (valence electrons)
A specific area where electrons (e-) of the same energy level are found
Either filled or partially filled last energy level of an atom that determine the chemical ...
Chemical Basis of Life
... Title: The Chemical Basis of Life
1- Introduction: Your body is an elaborate chemical system. Chemical reactions
power all of the body’s activities. At the most basic level, life is about
chemicals and how they interact with each other.
2- Matter – Matter is anything that has mass and occupies space ...
C2 Topic 1 Can Do Sheet
... 1.9 Describe the arrangement of elements in the periodic table such that:
a elements are arranged in order of increasing atomic number, in rows called periods
b elements with similar properties are placed in the same vertical column called groups
1.10 Demonstrate an understanding that the existence ...
Elements and Atoms - Portola Middle School
... neutron or proton. Protons
should have a + or P written on
them. Neutrons should be blank
or have an N.
In a circle around the
nucleus are the electrons.
Electrons should have a minus
sign or an e.
Chapter 6 Review“The Periodic Table”
... Review“The Periodic Table”
1. How is the number of neutrons in the nucleus of an atom calculated?
2. All atoms are neutral, with the number of protons equaling the ___.
3. Isotopes of the same element have different _____.
4. Using the periodic table, determine the number of neutrons in 16O.
5. What ...
CHEMISTRY TERMS Period: Elements in the same horizontal row
... Period: Elements in the same horizontal row with the same ground
state energy level.
Periodic Law: Elements list in order of their atomic numbers that fall
into reoccurring groups.
Ionic Radius: the radius of an atom’s ion, measured by the distance
between ions in a crystal lattice.
Atomic Radius: o ...
IPC Atoms and Periodic Table
... start with actinium
(Ac) at atomic number
89 and finishing up
with lawrencium (Lr)
at number 103.
• They are all
radioactive and some
are not found in
Chapter 6 Vocabulary crossword puzzle
... 3. Elements in which the highest occupied s and p sublevels are partially filled
6. Measures the ability of an atom to attract electrons when the atom is in a compound; the
element named Cesium has the lowest amount, while the element named Fluorine has the
7. Term that refers to a se ...
... I have some understanding but I need to revise this some more
I don’t know this or I need help because I don’t understand it
... (p+ and nº are
1835 x larger e-)
... Periodic table: A chart in which elements are arranged by increasing atomic
number and by changes in physical and chemical properties.
atom: The smallest particles that make up matter.
proton: a subatomic particle that has a positive charge and that is located in the
nucleus of an atom. (The number ...
... nucleus, but is still mostly empty.
•Electrons are in the cloud but can not be
pinpointed at an exact time because they move
Chapter 14 Review
... 9. What information can be obtained by knowing the atomic number of an element?
CLASS TEST NAME Class IIB Date ______ 1 .Which atomic
... 21. The electrons ______________________________________________________ around the nucleus in shells. The first shell,
which is _______________________________ the nucleus, can hold ________electrons, whereas the 2nd and 3rd shells can hold
Ions and isotopes
... has a different number of neutrons than
• Carbon has three isotopes
Extended periodic table
An extended periodic table theorizes about elements beyond element 118 (beyond period 7, or row 7). Currently seven periods in the periodic table of chemical elements are known and proven, culminating with atomic number 118. If further elements with higher atomic numbers than this are discovered, they will be placed in additional periods, laid out (as with the existing periods) to illustrate periodically recurring trends in the properties of the elements concerned. Any additional periods are expected to contain a larger number of elements than the seventh period, as they are calculated to have an additional so-called g-block, containing at least 18 elements with partially filled g-orbitals in each period. An eight-period table containing this block was suggested by Glenn T. Seaborg in 1969. IUPAC defines an element to exist if its lifetime is longer than 10−14 seconds, which is the time it takes for the nucleus to form an electronic cloud.No elements in this region have been synthesized or discovered in nature. The first element of the g-block may have atomic number 121, and thus would have the systematic name unbiunium. Elements in this region are likely to be highly unstable with respect to radioactive decay, and have extremely short half lives, although element 126 is hypothesized to be within an island of stability that is resistant to fission but not to alpha decay. It is not clear how many elements beyond the expected island of stability are physically possible, if period 8 is complete, or if there is a period 9.According to the orbital approximation in quantum mechanical descriptions of atomic structure, the g-block would correspond to elements with partially filled g-orbitals, but spin-orbit coupling effects reduce the validity of the orbital approximation substantially for elements of high atomic number. While Seaborg's version of the extended period had the heavier elements following the pattern set by lighter elements, as it did not take into account relativistic effects, models that take relativistic effects into account do not. Pekka Pyykkö and B. Fricke used computer modeling to calculate the positions of elements up to Z = 184 (comprising periods 8, 9, and the beginning of 10), and found that several were displaced from the Madelung rule.