basic knowledge
what is a property of alkali metals and alkaline earth metals?
The alkali metals have the high thermal and electrical conductivity, lustre, ductility, and malleability that are characteristic of metals. alkaline-earth elements are highly metallic and are good conductors of electricity.
H
hydrogen
what did plato do?
call the elements on the periodic table, elements
what is ionization energy?
ionization energy is the minimum amount of energy required to remove the most loosely bound electron of an isolated neutral gaseous atom or molecule.
what is a metal? and give an example of a metal and non metal
a metal is a type of element that is typically a hard, shiny solid and is a good conductor of heat and electricity. an example of a metal is Fe iron and an non metal is C carbon
what is a property of halogens and noble gases
Halogens are very reactive because they have seven valence electrons, noble gases have filled valence shells as they occur in nature.
aluminium
who created the first 'periodic table'
aristole he created the pundent square of dry, wet, hot, and cold
what is electronegativity?
measures the tendency of an atom to attract a shared pair of electrons
what is chemical reactivity?
a chemical substance undergoes a chemical reaction, either by itself or with other materials, with an overall release of energy.
where is Ti located on the periodic table?
23! period 4 group 4
Ag
silver
who is antoine lavoisier?
in the 1700s, he said "if it can be decomposed its not an element" "if it cannot be separated it is not an element"
what is a atomic radius
atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons.
what is ion charge?
An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule.
describe and predict a metallic element
has to have these properties for the outer shell of valence electrons, easily reduced, can displace hydrogen from acids, forms basic bases and chlorides. the most metallic elements are located on the bottom left side of the periodic table.
OH
hydroxide
what are elements made in a lab
synthetic elements
on the bottom left side of the periodic table it is...
the most metallic, has the largest atomic radius, the least ionization energy, and the least electron affinity
what is conductivity?
Electrical Conductivity measures a material's ability to conduct electricity. Generally metals conduct better than non-metals. for an element to conduct electricity, it must have free electron to move around.
the atomic number of an atom is the number of the (blank) in the atoms nucleus
protons
CH3COO
ethanoate, acetate
who made the first official periodic table?
dimitri mendeleev
Pick false statements from the following.
(a) The left side of the periodic table consists of the most electronegative elements and the right side of the table consist of the most electropositive elements.
(b) Paramagnetic nature, variable oxidation states, coloured compounds are exhibited by transition elements.
(c) Alkalis and alkaline earth metals react with water, liberating oxygen.
(d) Elements with a more metallic character form acidic oxides and with more non-metallic character form basic oxides
(e) Melting and boiling points of metals and non-metals increase and decrease respectively along with a group
(f) Elements belonging to groups IA-VIIA are called representative elements
a,c,d, and e
A term describing a phenomenon where certain isotopes known as ______ are subject to a form of "decay" brought about by the emission of high-energy particles.
radioactivity