C3 The Periodic Table
... ordered (based on patterns of behaviour, then on
mass) and made little sense.
• In 1964 Newlands attempted to put it in a sensible
order by mass and saw similarities between every 8th
• Mendeleev ordered the elements based on their
atomic weights and arranged them so there was a
Grouping of Elements in the Periodic Table
... Self Assessment: Grouping of Elements in the Periodic Table
6. Which of the following statements is true?
a) Some transactinides are also actinides.
b) Some actinides are also lanthanides.
c) Some transuraniums are also transactinides.
d) Some lanthanides are also transuraniums.
7. Which elements ...
Unit 4 Review - Davis
... Metal Activity – how easily metals lose electrons to react and form
Nonmetal Activity – how easily nonmetals gain electrons to react and
form negative ions
Electronegativity – attraction that one atom for the outer shell
electron of another atom
Ionization Energy – the energy needed to ...
In the space provided, write the letter of the term or phrase that best
... ______ 5. Nonmetallic elements in Group 17 that react with most metals to form salts are
a. alkali metals.
d. noble gases.
______ 6. The outer-level electron configuration of a neutral alkaline-earth metal atom consists of
a. one electron in the s orbital.
b. two electro ...
... material that can be pulled out into a long
Conductor – a substance that transmits
heat or electricity easily.
Magnetic – a characteristic of metals in
which it is attracted to magnets or can be
made into a magnet.
Chemical Properties of Metals
Reactivity – ease and speed with which an
... • All atoms what to have a balanced charge but they also want to have a full
valance shell. Atoms will often take, loose or share electrons on order to
fill the valance. All atoms that have the same # of electrons behave in a
similar fashion. The atoms with fewer electrons on the valance and/or the
The Periodic Table
... atom of an element
• The 1st period has 2 elements H and He.
• The 2nd period goes from Li to Ne.
• The 3rd period goes from Na to Ar.
Chapter 8 Study Guide
... Period- (7) rows of the periodic table; elements are NOT similar in same period
Most of the elements are classified as metals.
Properties of elements change as you go across a period.
Alkali Metals I- most reactive metals
Alkaline Earth Metals II- not as reactive as Alkali Metals
Halogens (VII)- mos ...
Periodic Table and Atomic Structure Summary
... Group 0 (or 8) – The Noble (or Monatomic) Gases
The gases in this group are all colourless. They are unreactive and form almost no known
chemical compounds. These gases can be used in lasers and lighting.
Every element is made up of small particles called atoms.
Each element contains one type of at ...
... involve removing an electron from a stable inert gas-like electron configuration. This would be
much larger than the second ionization energy for Be, where the second-ionization step results in
the formation of an inert gas like electron configuration.)
14- For each of the following pairs, which ele ...
The Periodic Table
... Henry Moseley changed Mendeleev’s
periodic table and put the atoms in order
according to increasing atomic number
This fixed the problem. Now all of the
elements fell into place
2- Periodic Trends
... Mendeleev (correctly) predicted the mass of elements yet to
be discovered and left spaces open for them
... generally the melting points of non-metals are generally lower than metals. And
finally compounds of metals with non-metals tend to be ionic in nature as
opposed to non-metal’s being nonmetal oxides are acidic oxide.
4. Sodium is in group #1 are moved in positions from those indicated strictly by
Name: Per: _____ Date: ______ Unit 5 Redemption Packet: The
... questions. If you missed any notes, you will find them at www.starkchemistry.weebly.com.
1. Mendeleev arranged the elements in his periodic table by increasing _______________
2. Why did Mendeleev leave spaces in his periodic table?
Chapter 12 The Periodic Table
... Remember, the atomic number is the number of
protons all atoms of that element have in their
If the atom is neutral, it will have the same
number of electrons as protons.
The alkali metals are a group (column) in the periodic table consisting of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr). This group lies in the s-block of the periodic table as all alkali metals have their outermost electron in an s-orbital: this element/electron configuration results in their characteristic properties. The alkali metals provide the best example of group trends in properties in the periodic table, with elements exhibiting well-characterized homologous behaviour.The alkali metals have very similar properties: they are all shiny, soft, highly reactive metals at standard temperature and pressure and readily lose their outermost electron to form cations with charge +1. They can all be cut easily with a knife due to their softness, exposing a shiny surface that tarnishes rapidly in air due to oxidation by atmospheric moisture and oxygen. Because of their high reactivity, they must be stored under oil to prevent reaction with air, and are found naturally only in salts and never as the free element. In the modern IUPAC nomenclature, the alkali metals comprise the group 1 elements, excluding hydrogen (H), which is nominally a group 1 element but not normally considered to be an alkali metal as it rarely exhibits behaviour comparable to that of the alkali metals. All the alkali metals react with water, with the heavier alkali metals reacting more vigorously than the lighter ones.All of the discovered alkali metals occur in nature: in order of abundance, sodium is the most abundant, followed by potassium, lithium, rubidium, caesium, and finally francium, which is very rare due to its extremely high radioactivity and thus occurs only in traces due to its presence in natural decay chains. Experiments have been conducted to attempt the synthesis of ununennium (Uue), which is likely to be the next member of the group, but they have all met with failure. However, ununennium may not be an alkali metal due to relativistic effects, which are predicted to have a large influence on the chemical properties of superheavy elements; even if it does turn out to be an alkali metal, it is predicted to have some differences in physical and chemical properties from its lighter homologues.Most alkali metals have many different applications. Two of the most well-known applications of the pure elements are rubidium and caesium atomic clocks, of which caesium atomic clocks are the most accurate and precise representation of time. A common application of the compounds of sodium is the sodium-vapour lamp, which emits very efficient light. Table salt, or sodium chloride, has been used since antiquity. Sodium and potassium are also essential elements, having major biological roles as electrolytes, and although the other alkali metals are not essential, they also have various effects on the body, both beneficial and harmful.